---
title: extent
framework: arkit
role: symbol
role_heading: Instance Property
path: arkit/arworldmap/extent
---

# extent

The size of the world map’s space-mapping data, relative to the world coordinate origin of the session the map was recorded in.

## Declaration

```swift
var extent: simd_float3 { get }
```

## Discussion

Discussion The extent and center properties together define a bounding box for the data recorded in the world map.

## See Also

### Examining a World Map

- [anchors](arkit/arworldmap/anchors.md)
- [center](arkit/arworldmap/center.md)