> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wherobots.com/llms.txt
> Use this file to discover all available pages before exploring further.
# ST_Intersects
Return true if A intersects B. Polymorphic over input type:
* `(Geometry, Geometry)` — topological intersection via JTS.
* `(Geography, Geography)` — topological intersection via S2.
* `(Box2D, Box2D)` — closed-interval bbox intersection on both axes (PostGIS `&&` on `box2d`); edge- and corner-touching boxes count as intersecting. Throws `IllegalArgumentException` on inverted bounds. See [Box2D optimization](#box2d-optimization) below.
* `(Box3D, Box3D)` — closed-interval bbox intersection on all three axes (PostGIS `&&&` on `box3d`). Throws on inverted bounds on any axis.
## Signatures
```sql theme={"system"}
ST_Intersects (A: Geometry, B: Geometry)
```
```sql theme={"system"}
ST_Intersects (A: Geography, B: Geography)
```
```sql theme={"system"}
ST_Intersects (A: Box2D, B: Box2D)
```
```sql theme={"system"}
ST_Intersects (A: Box3D, B: Box3D)
```
## Parameters
The first input. `Box2D` / `Box3D` inputs use closed-interval semantics.
The second input, of the same type family as `A`.
## Return type
`true` if A intersects B.
## Example
```sql theme={"system"}
SELECT ST_Intersects(ST_GeomFromWKT('LINESTRING(-43.23456 72.4567,-43.23456 72.4568)'), ST_GeomFromWKT('POINT(-43.23456 72.4567772)'))
```
```
true
```
Box2D example:
```sql theme={"system"}
SELECT ST_Intersects(
ST_MakeBox2D(ST_Point(0.0, 0.0), ST_Point(10.0, 10.0)),
ST_MakeBox2D(ST_Point(5.0, 5.0), ST_Point(15.0, 15.0)))
```
```
true
```
For `Box3D` inputs the test covers all three axes — two boxes whose XY footprints overlap but whose Z ranges are disjoint do **not** intersect:
## Box2D optimization
`ST_Intersects(box_col, lit_box)` over a `Box2D` column and a literal `Box2D` is recognized by Sedona's spatial optimizer:
* **Filter pushdown.** When the column is a `Box2D` stored in GeoParquet, the predicate translates to Parquet row-group inequalities on the `xmin` / `ymin` / `xmax` / `ymax` leaves. See [Box2D filter pushdown](/reference/wherobots-db/geometry-data/optimizer#box2d-filter-pushdown).
* **Spatial join.** `ST_Intersects(a, b)` between two `Box2D` columns is planned as a range or broadcast-index join. See [Box2D spatial join](/reference/wherobots-db/geometry-data/optimizer#box2d-spatial-join).