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# CLRegion

A base class representing an area that can be monitored.

```
class CLRegion
```

## Overview

This is an abstract base class. Instantiate one of the provided subclasses that define specific types of regions. After you create a region, register it with a [`CLLocationManager`](/documentation/CoreLocation/CLLocationManager) object with the [`startMonitoring(for:)`](/documentation/CoreLocation/CLLocationManager/startMonitoring(for:)) method. The location manager generates appropriate events whenever the user crosses the boundaries of the region.

## Topics

### Getting the region identifier

[`identifier`](/documentation/CoreLocation/CLRegion/identifier)

The identifier for the region object.

### Specifying the notification conditions

[`notifyOnEntry`](/documentation/CoreLocation/CLRegion/notifyOnEntry)

A Boolean indicating that notifications are generated upon entry into the region.

[`notifyOnExit`](/documentation/CoreLocation/CLRegion/notifyOnExit)

A Boolean indicating that notifications are generated upon exit from the region.

### Deprecated

[`-  initCircularRegionWithCenter:radius:identifier:`](/documentation/CoreLocation/CLRegion/init(circularRegionWithCenter:radius:identifier:))

Initializes and returns a region object defining a circular area.

[`-  containsCoordinate:`](/documentation/CoreLocation/CLRegion/contains(_:))

Returns a Boolean value indicating whether the region contains the specified coordinate.

[`center`](/documentation/CoreLocation/CLRegion/center)

The center point of the region.

[`radius`](/documentation/CoreLocation/CLRegion/radius)

The radius (measured in meters) that defines the region’s outer boundary.

## Relationships

### Conforms To

[`NSSecureCoding`](/documentation/Foundation/NSSecureCoding)

[`Equatable`](/documentation/Swift/Equatable)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`NSCoding`](/documentation/Foundation/NSCoding)

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`NSCopying`](/documentation/Foundation/NSCopying)

[`Hashable`](/documentation/Swift/Hashable)

[`CVarArg`](/documentation/Swift/CVarArg)

### Inherited By

[`CLBeaconRegion`](/documentation/CoreLocation/CLBeaconRegion)

[`CLCircularRegion`](/documentation/CoreLocation/CLCircularRegion)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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