> ## 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_Envelope

This function returns the bounding box (envelope) of A. It's important to note that the bounding box is calculated using a cylindrical topology, not a spherical one. If the envelope crosses the antimeridian (the 180° longitude line), you can set the split parameter to true. This will return a Geography object containing two separate Polygon objects, split along that line.

## Signatures

```sql theme={"system"}
ST_Envelope (A: Geography, splitAtAntiMeridian: Boolean)
```

## Parameters

<ParamField body="A" type="Geography" required>
  The input geometry.
</ParamField>

<ParamField body="splitAtAntiMeridian" type="Boolean" required>
  The split at anti meridian value.
</ParamField>

## Return type

<ResponseField type="Geography">
  The computed result.
</ResponseField>

## Example

```sql theme={"system"}
SELECT ST_Envelope(ST_GeogFromWKT('MULTIPOLYGON (((177.285 -18.28799, 180 -18.28799, 180 -16.02088, 177.285 -16.02088, 177.285 -18.28799)), ((-180 -18.28799, -179.7933 -18.28799, -179.7933 -16.02088, -180 -16.02088, -180 -18.28799)))'), false);
```

```
POLYGON ((177.3 -18.3, -179.8 -18.3, -179.8 -16, 177.3 -16, 177.3 -18.3))
```