The Brecon Beacons (Welsh: Bannau Brycheiniog) are a mountain chain in southeast Wales. The name refers to the medieval mountaintop beacons used to warn of marauding Angle Saxons. The mountain chain forms the center of Brecon Beacons National Park, which covers nearly 1,400 square kilometers and is probably the most beautiful of the three Welsh national parks. Just west of the Beacons lies Fforest Fawr, a large dense forest that has been declared a UNESCO Geopark. The national park is a great place for hiking, biking, horseback riding, sailing, windsurfing and canoeing.