> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cockroachlabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ST_CoveredBy

Given two shapes *A* and *B*, the predicate function `ST_CoveredBy(A, B)` returns `true` if no point in *A* lies outside of shape *B*.  Otherwise, it returns `false`.

In other words, shape *B* must completely cover every point in *A*.

`ST_CoveredBy` works on the following data types:

* [`GEOMETRY`](/docs/stable/architecture/glossary#geometry)
* [`GEOGRAPHY`](/docs/stable/architecture/glossary#geography)

> [!NOTE]
>
> \`\` will attempt to use any available [spatial index](/docs/stable/spatial-indexes.md) to speed up its operation.  Use the prefixed variant `_` if you do not want any spatial indexes to be used.

> [!NOTE]
>
> This function is the inverse of [`ST_Covers`](/docs/stable/st_covers).

## Examples

> [!NOTE]
>
> The screenshots in these examples were generated using [geojson.io](http://geojson.io), but they are designed to showcase the shapes, not the map.  Representing `GEOMETRY` data in GeoJSON can lead to unexpected results if using geometries with [SRIDs](/docs/stable/architecture/glossary.md#srid) other than 4326 (as shown below).

### True

In this example, \`\` returns `true` because:

* No Point in the smaller Polygon *A* lies outside of the larger Polygon *B*.

```sql theme={"theme":{"light":"catppuccin-mocha","dark":"catppuccin-mocha"}}
SELECT ST_CoveredBy(st_geomfromtext('SRID=4326;POLYGON((-87.623177 41.881832, -90.199402 38.627003, -82.446732 38.413651, -87.623177 41.881832))'), st_geomfromtext('SRID=4326;POLYGON((-87.906471 43.038902, -95.992775 36.153980, -75.704722 36.076944, -87.906471 43.038902))'));
```

```
  st_coveredby
----------------
      true
(1 row)
```

![ST\_CoveredBy - true](https://mintcdn.com/cockroachlabs/bBD0UEapbn6fk8Rb/images/common/geospatial/st_coveredby_true.png?fit=max\&auto=format\&n=bBD0UEapbn6fk8Rb\&q=85\&s=1eee434fc3295282c9cd82dc5890766f)

### False

In this example, \`\` returns `false` because:

* Many Points in the smaller Polygon *A* lie outside of the larger Polygon *B*.

```sql theme={"theme":{"light":"catppuccin-mocha","dark":"catppuccin-mocha"}}
SELECT ST_CoveredBy(st_geomfromtext('SRID=4326;POLYGON((-87.906471 43.038902, -95.992775 36.153980, -75.704722 36.076944, -87.906471 43.038902))'), st_geomfromtext('SRID=4326;POLYGON((-84.191605 39.758949, -75.165222 39.952583, -78.878738 42.880230, -84.191605 39.758949))'));
```

```
  st_coveredby
----------------
     false
(1 row)
```

![ST\_CoveredBy - false](https://mintcdn.com/cockroachlabs/bBD0UEapbn6fk8Rb/images/common/geospatial/st_coveredby_false.png?fit=max\&auto=format\&n=bBD0UEapbn6fk8Rb\&q=85\&s=1fd7c6f3e4af2d1e4ba05dc9e5638a5a)

## See also

* [Spatial and GIS Glossary of Terms](/docs/stable/architecture/glossary.md)
* [Spatial indexes](/docs/stable/spatial-indexes.md)
* [Spatial functions](/docs/stable/functions-and-operators.md#spatial-functions)
* [`ST_Covers`](/docs/stable/st_covers)
* [`ST_Contains`](/docs/stable/st_contains)
* [`ST_Within`](/docs/stable/st_within)
* [`ST_Intersects`](/docs/stable/st_intersects)
* [`ST_CoveredBy`](/docs/stable/st_coveredby)
* [`ST_Covers`](/docs/stable/st_covers)
* [`ST_Disjoint`](/docs/stable/st_disjoint)
* [`ST_Equals`](/docs/stable/st_equals)
* [`ST_Overlaps`](/docs/stable/st_overlaps)
* [`ST_Touches`](/docs/stable/st_touches)
* [`ST_ConvexHull`](/docs/stable/st_convexhull)
* [`ST_Union`](/docs/stable/st_union)
* [Migrate from Shapefiles](/docs/stable/migrate-from-shapefiles.md)
* [Migrate from GeoJSON](/docs/stable/migrate-from-geojson.md)
* [Migrate from GeoPackage](/docs/stable/migrate-from-geopackage.md)
* [Migrate from OpenStreetMap](/docs/stable/migrate-from-openstreetmap.md)
* [Introducing Distributed Spatial Data in CockroachDB](https://www.cockroachlabs.com/blog/spatial-data/) (blog post)