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# init(circularRegionWithCenter:radius:identifier:)

Initializes and returns a region object defining a circular area.

```
init(circularRegionWithCenter center: CLLocationCoordinate2D, radius: CLLocationDistance, identifier: String)
```

## Parameters

`center`

The center point of the region.

`radius`

The distance (measured in meters) from the center point that marks the boundary of the region.

`identifier`

A unique identifier to associate with the region object. You use this identifier to differentiate regions within your application. This value must not be `nil`.

## Return Value

An initialized region object.

## Discussion

In iOS, use a [`CLCircularRegion`](/documentation/CoreLocation/CLCircularRegion) object to manage geographic regions.

---

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