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    "preciseIdentifier" : "cl/mapkit.BoundingRegion"
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  "title" : "BoundingRegion"
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# BoundingRegion

A rectangular area on a map, which coordinates of the rectangle’s northeast and southwest corners define.

```
class BoundingRegion
```

## Overview

Similar to a [`CoordinateRegion`](/documentation/MapKitJS/CoordinateRegion), [`BoundingRegion`](/documentation/MapKitJS/BoundingRegion) represents a rectangular area on the 2D-projected surface. However, instead of describing a center coordinate and a span, MapKit JS defines a bounding region by the coordinates of the rectangle’s northeast and southwest corners.

## Topics

### Creating a bounding region

[`constructor(
    northLatitude?: number,
    eastLongitude?: number,
    southLatitude?: number,
    westLongitude?: number,
);`](/documentation/MapKitJS/BoundingRegion/BoundingRegionConstructor)

Creates a rectangular bounding region, which the latitude and longitude coordinates of the rectangle’s northeast and southwest corners define.

### Defining a bounding region

[`eastLongitude: number;`](/documentation/MapKitJS/BoundingRegion/eastLongitude)

The east longitude of the bounding region.

[`northLatitude: number;`](/documentation/MapKitJS/BoundingRegion/northLatitude)

The north latitude of the bounding region.

[`southLatitude: number;`](/documentation/MapKitJS/BoundingRegion/southLatitude)

The south latitude of the bounding region.

[`westLongitude: number;`](/documentation/MapKitJS/BoundingRegion/westLongitude)

The west longitude of the bounding region.

### Copying and converting regions

[`copy(): BoundingRegion;`](/documentation/MapKitJS/BoundingRegion/copy)

Returns a copy of the calling bounding region.

[`toCoordinateRegion(): CoordinateRegion;`](/documentation/MapKitJS/BoundingRegion/toCoordinateRegion)

Returns the coordinate region that corresponds to the calling bounding region.

### Instance Methods

[`toString(): string;`](/documentation/MapKitJS/BoundingRegion/toString)

Returns a string representation of the bounding region object.

---

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