diff --git a/edgedb-protocol/src/codec.rs b/edgedb-protocol/src/codec.rs
index 7eddbe10..e2c3154e 100644
--- a/edgedb-protocol/src/codec.rs
+++ b/edgedb-protocol/src/codec.rs
@@ -49,6 +49,10 @@ pub const STD_PG_TIMESTAMPTZ: UuidVal = UuidVal::from_u128(0x1000002);
 pub const STD_PG_TIMESTAMP: UuidVal = UuidVal::from_u128(0x1000003);
 pub const STD_PG_DATE: UuidVal = UuidVal::from_u128(0x1000004);
 pub const STD_PG_INTERVAL: UuidVal = UuidVal::from_u128(0x1000005);
+pub const POSTGIS_GEOMETRY: UuidVal = UuidVal::from_u128(0x44c901c0_d922_4894_83c8_061bd05e4840);
+pub const POSTGIS_GEOGRAPHY: UuidVal = UuidVal::from_u128(0x4d738878_3a5f_4821_ab76_9d8e7d6b32c4);
+pub const POSTGIS_BOX_2D: UuidVal = UuidVal::from_u128(0x7fae5536_6311_4f60_8eb9_096a5d972f48);
+pub const POSTGIS_BOX_3D: UuidVal = UuidVal::from_u128(0xc1a50ff8_fded_48b0_85c2_4905a8481433);
 
 pub(crate) fn uuid_to_known_name(uuid: &UuidVal) -> Option<&'static str> {
     match *uuid {
@@ -78,6 +82,10 @@ pub(crate) fn uuid_to_known_name(uuid: &UuidVal) -> Option<&'static str> {
         STD_PG_TIMESTAMP => Some("BaseScalar(std::pg::timestamp)"),
         STD_PG_DATE => Some("BaseScalar(std::pg::date)"),
         STD_PG_INTERVAL => Some("BaseScalar(std::pg::interval)"),
+        POSTGIS_GEOMETRY => Some("BaseScalar(ext::postgis::geometry)"),
+        POSTGIS_GEOGRAPHY => Some("BaseScalar(ext::postgis::geography)"),
+        POSTGIS_BOX_2D => Some("BaseScalar(ext::postgis::box2d)"),
+        POSTGIS_BOX_3D => Some("BaseScalar(ext::postgis::box3d)"),
         _ => None,
     }
 }
@@ -257,6 +265,18 @@ pub struct Enum {
     members: HashSet<Arc<str>>,
 }
 
+#[derive(Debug)]
+pub struct PostGisGeometry {}
+
+#[derive(Debug)]
+pub struct PostGisGeography {}
+
+#[derive(Debug)]
+pub struct PostGisBox2d {}
+
+#[derive(Debug)]
+pub struct PostGisBox3d {}
+
 struct CodecBuilder<'a> {
     descriptors: &'a [Descriptor],
 }
@@ -376,6 +396,10 @@ pub fn scalar_codec(uuid: &UuidVal) -> Result<Arc<dyn Codec>, CodecError> {
         STD_PG_TIMESTAMP => Ok(Arc::new(LocalDatetime {})),
         STD_PG_DATE => Ok(Arc::new(LocalDate {})),
         STD_PG_INTERVAL => Ok(Arc::new(RelativeDuration {})),
+        POSTGIS_GEOMETRY => Ok(Arc::new(PostGisGeometry {})),
+        POSTGIS_GEOGRAPHY => Ok(Arc::new(PostGisGeography {})),
+        POSTGIS_BOX_2D => Ok(Arc::new(PostGisBox2d {})),
+        POSTGIS_BOX_3D => Ok(Arc::new(PostGisBox3d {})),
         _ => errors::UndefinedBaseScalar { uuid: uuid.clone() }.fail()?,
     }
 }
@@ -1484,3 +1508,59 @@ impl Codec for Enum {
         Ok(())
     }
 }
+
+impl Codec for PostGisGeometry {
+    fn decode(&self, buf: &[u8]) -> Result<Value, DecodeError> {
+        RawCodec::decode(buf).map(Value::PostGisGeometry)
+    }
+    fn encode(&self, buf: &mut BytesMut, val: &Value) -> Result<(), EncodeError> {
+        let val = match val {
+            Value::PostGisGeometry(val) => val,
+            _ => Err(errors::invalid_value(type_name::<Self>(), val))?,
+        };
+        buf.extend(val);
+        Ok(())
+    }
+}
+
+impl Codec for PostGisGeography {
+    fn decode(&self, buf: &[u8]) -> Result<Value, DecodeError> {
+        RawCodec::decode(buf).map(Value::PostGisGeography)
+    }
+    fn encode(&self, buf: &mut BytesMut, val: &Value) -> Result<(), EncodeError> {
+        let val = match val {
+            Value::PostGisGeography(val) => val,
+            _ => Err(errors::invalid_value(type_name::<Self>(), val))?,
+        };
+        buf.extend(val);
+        Ok(())
+    }
+}
+
+impl Codec for PostGisBox2d {
+    fn decode(&self, buf: &[u8]) -> Result<Value, DecodeError> {
+        RawCodec::decode(buf).map(Value::PostGisBox2d)
+    }
+    fn encode(&self, buf: &mut BytesMut, val: &Value) -> Result<(), EncodeError> {
+        let val = match val {
+            Value::PostGisBox2d(val) => val,
+            _ => Err(errors::invalid_value(type_name::<Self>(), val))?,
+        };
+        buf.extend(val);
+        Ok(())
+    }
+}
+
+impl Codec for PostGisBox3d {
+    fn decode(&self, buf: &[u8]) -> Result<Value, DecodeError> {
+        RawCodec::decode(buf).map(Value::PostGisBox3d)
+    }
+    fn encode(&self, buf: &mut BytesMut, val: &Value) -> Result<(), EncodeError> {
+        let val = match val {
+            Value::PostGisBox3d(val) => val,
+            _ => Err(errors::invalid_value(type_name::<Self>(), val))?,
+        };
+        buf.extend(val);
+        Ok(())
+    }
+}
diff --git a/edgedb-protocol/src/query_arg.rs b/edgedb-protocol/src/query_arg.rs
index 1ed5fb3c..6869e694 100644
--- a/edgedb-protocol/src/query_arg.rs
+++ b/edgedb-protocol/src/query_arg.rs
@@ -203,6 +203,10 @@ impl QueryArg for Value {
             Enum(v) => v.encode_slot(enc)?,
             Range(v) => v.encode_slot(enc)?,
             Vector(v) => v.encode_slot(enc)?,
+            PostGisGeometry(v) => v.encode_slot(enc)?,
+            PostGisGeography(v) => v.encode_slot(enc)?,
+            PostGisBox2d(v) => v.encode_slot(enc)?,
+            PostGisBox3d(v) => v.encode_slot(enc)?,
         }
 
         Ok(())
@@ -238,6 +242,10 @@ impl QueryArg for Value {
                 let val = val.deref();
                 check_enum(val, &members)
             }
+            (PostGisGeometry(_), BaseScalar(d)) if d.id == codec::POSTGIS_GEOMETRY => Ok(()),
+            (PostGisGeography(_), BaseScalar(d)) if d.id == codec::POSTGIS_GEOGRAPHY => Ok(()),
+            (PostGisBox2d(_), BaseScalar(d)) if d.id == codec::POSTGIS_BOX_2D => Ok(()),
+            (PostGisBox3d(_), BaseScalar(d)) if d.id == codec::POSTGIS_BOX_3D => Ok(()),
             // TODO(tailhook) all types
             (_, desc) => Err(ctx.wrong_type(&desc, self.kind())),
         }
diff --git a/edgedb-protocol/src/value.rs b/edgedb-protocol/src/value.rs
index b1548412..2501cc53 100644
--- a/edgedb-protocol/src/value.rs
+++ b/edgedb-protocol/src/value.rs
@@ -46,6 +46,10 @@ pub enum Value {
     Vector(Vec<f32>),
     Enum(EnumValue),
     Range(Range<Box<Value>>),
+    PostGisGeometry(bytes::Bytes),
+    PostGisGeography(bytes::Bytes),
+    PostGisBox2d(bytes::Bytes),
+    PostGisBox3d(bytes::Bytes),
 }
 
 #[derive(Clone, Debug)]
@@ -88,6 +92,10 @@ impl Value {
             Tuple(..) => "tuple",
             Uuid(..) => "uuid",
             Vector(..) => "ext::pgvector::vector",
+            PostGisGeometry(..) => "ext::postgis::geometry",
+            PostGisGeography(..) => "ext::postgis::geography",
+            PostGisBox2d(..) => "ext::postgis::box2d",
+            PostGisBox3d(..) => "ext::postgis::box3d",
         }
     }
     pub fn empty_tuple() -> Value {
diff --git a/edgedb-protocol/tests/codecs.rs b/edgedb-protocol/tests/codecs.rs
index a3f9bf92..53a2e975 100644
--- a/edgedb-protocol/tests/codecs.rs
+++ b/edgedb-protocol/tests/codecs.rs
@@ -4,7 +4,7 @@ extern crate pretty_assertions;
 use std::error::Error;
 use std::sync::Arc;
 
-use bytes::Bytes;
+use bytes::{Buf, Bytes};
 
 use edgedb_protocol::codec::build_codec;
 use edgedb_protocol::codec::{Codec, ObjectShape};
@@ -1201,3 +1201,230 @@ fn multi_range() -> Result<(), Box<dyn Error>> {
     );
     Ok(())
 }
+
+#[test]
+fn postgis_geometry() -> Result<(), Box<dyn Error>> {
+    let codec = build_codec(
+        Some(TypePos(0)),
+        &[Descriptor::BaseScalar(BaseScalarTypeDescriptor {
+            id: "44c901c0-d922-4894-83c8-061bd05e4840"
+                .parse::<Uuid>()?
+                .into(),
+        })],
+    )?;
+
+    encoding_eq!(
+        &codec,
+        /*
+         * Point
+         * 01 - byteOrder, Little Endian
+         * 01000000 - wkbType, WKBPoint
+         * 0000000000000040 - x, 2.0
+         * 000000000000F03F - y, 1.0
+         */
+        b"\
+        \x01\
+        \x01\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        ",
+        Value::PostGisGeometry(
+            b"\
+            \x01\
+            \x01\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            "[..]
+                .into()
+        )
+    );
+    Ok(())
+}
+
+#[test]
+fn postgis_geography() -> Result<(), Box<dyn Error>> {
+    let codec = build_codec(
+        Some(TypePos(0)),
+        &[Descriptor::BaseScalar(BaseScalarTypeDescriptor {
+            id: "4d738878-3a5f-4821-ab76-9d8e7d6b32c4"
+                .parse::<Uuid>()?
+                .into(),
+        })],
+    )?;
+    encoding_eq!(
+        &codec,
+        /*
+         * Point
+         * 01 - byteOrder, Little Endian
+         * 01000000 - wkbType, WKBPoint
+         * 0000000000000040 - x, 2.0
+         * 000000000000F03F - y, 1.0
+         */
+        b"\
+        \x01\
+        \x01\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        ",
+        Value::PostGisGeometry(
+            b"\
+            \x01\
+            \x01\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            "[..]
+                .into()
+        )
+    );
+    Ok(())
+}
+
+#[test]
+fn postgis_box_2d() -> Result<(), Box<dyn Error>> {
+    let codec = build_codec(
+        Some(TypePos(0)),
+        &[Descriptor::BaseScalar(BaseScalarTypeDescriptor {
+            id: "7fae5536-6311-4f60-8eb9-096a5d972f48"
+                .parse::<Uuid>()?
+                .into(),
+        })],
+    )?;
+    encoding_eq!(
+        &codec,
+        /*
+         * Polygon
+         * 01 - byteOrder, Little Endian
+         * 03000000 - wkbType, wkbPolygon
+         * 01000000 - numRings, 1
+         * 05000000 - numPoints, 5
+         * 000000000000F03F - x, 1.0
+         * 000000000000F03F - y, 1.0
+         * 0000000000000040 - x, 2.0
+         * 000000000000F03F - y, 1.0
+         * 0000000000000040 - x, 2.0
+         * 0000000000000040 - y, 2.0
+         * 000000000000F03F - x, 1.0
+         * 0000000000000040 - y, 2.0
+         * 000000000000F03F - x, 1.0
+         * 000000000000F03F - y, 1.0
+         */
+        b"\
+        \x01\
+        \x03\x00\x00\x00\
+        \x01\x00\x00\x00\
+        \x05\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        ",
+        Value::PostGisBox2d(
+            b"\
+            \x01\
+            \x03\x00\x00\x00\
+            \x01\x00\x00\x00\
+            \x05\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            "[..]
+                .into()
+        )
+    );
+    Ok(())
+}
+
+#[test]
+fn postgis_box_3d() -> Result<(), Box<dyn Error>> {
+    let codec = build_codec(
+        Some(TypePos(0)),
+        &[Descriptor::BaseScalar(BaseScalarTypeDescriptor {
+            id: "c1a50ff8-fded-48b0-85c2-4905a8481433"
+                .parse::<Uuid>()?
+                .into(),
+        })],
+    )?;
+    encoding_eq!(
+        &codec,
+        /*
+         * Polygon
+         * 01 - byteOrder, Little Endian
+         * 03000080 - wkbType, wkbPolygonZ
+         * 01000000 - numRings, 1
+         * 05000000 - numPoints, 5
+         * 000000000000F03F - x, 1.0
+         * 000000000000F03F - y, 1.0
+         * 0000000000000000 - z, 0.0
+         * 0000000000000040 - x, 2.0
+         * 000000000000F03F - y, 1.0
+         * 0000000000000000 - z, 0.0
+         * 0000000000000040 - x, 2.0
+         * 0000000000000040 - y, 2.0
+         * 000000000000F03F - x, 1.0
+         * 0000000000000000 - z, 0.0
+         * 0000000000000040 - y, 2.0
+         * 000000000000F03F - x, 1.0
+         * 000000000000F03F - y, 1.0
+         * 0000000000000000 - z, 0.0
+         */
+        b"\
+        \x01\
+        \x03\x00\x00\x80\
+        \x01\x00\x00\x00\
+        \x05\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x40\
+        \x00\x00\x00\x00\x00\x00\x00\x00\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\xF0\x3F\
+        \x00\x00\x00\x00\x00\x00\x00\x00\
+        ",
+        Value::PostGisBox3d(
+            b"\
+            \x01\
+            \x03\x00\x00\x80\
+            \x01\x00\x00\x00\
+            \x05\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x40\
+            \x00\x00\x00\x00\x00\x00\x00\x00\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\xF0\x3F\
+            \x00\x00\x00\x00\x00\x00\x00\x00\
+            "[..]
+                .into()
+        )
+    );
+    Ok(())
+}