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# ST_Intersects
Tests whether two geography objects intersect on the sphere using S2 spherical boolean operations. Returns `true` if `A` and `B` share any portion of space (including a single boundary point), and `false` if they are fully disjoint.
Edges are interpreted as great-circle arcs, so the test is correct even when geographies cross the antimeridian or wrap around the poles — situations where a planar `ST_Intersects` would be wrong.
## Signatures
```sql theme={"system"}
ST_Intersects (A: Geography, B: Geography)
```
## Parameters
The first geography.
The second geography.
## Return type
`true` if A and B intersect.
## Example
Overlapping polygons:
```sql theme={"system"}
SELECT ST_Intersects(
ST_GeogFromWKT('POLYGON ((0 0, 2 0, 2 2, 0 2, 0 0))', 4326),
ST_GeogFromWKT('POLYGON ((1 1, 3 1, 3 3, 1 3, 1 1))', 4326)
);
```
```
true
```
Disjoint polygons:
```sql theme={"system"}
SELECT ST_Intersects(
ST_GeogFromWKT('POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))', 4326),
ST_GeogFromWKT('POLYGON ((10 10, 11 10, 11 11, 10 11, 10 10))', 4326)
);
```
```
false
```