Binevenagh is a large, steep-sided hill in County Londonderry, Northern Ireland. It is part of the Keenaght Hills, which mark the western edge of the Antrim Plateau, formed around 60 million years ago by molten lava. Binevenagh and its cliffs overlook the Magilligan peninsula and dominate the skyline over the villages of Bellarena, Downhill, Castlerock and B…Binevenagh is a large, steep-sided hill in County Londonderry, Northern Ireland. It is part of the Keenaght Hills, which mark the western edge of the Antrim Plateau, formed around 60 million years ago by molten lava. Binevenagh and its cliffs overlook the Magilligan peninsula and dominate the skyline over the villages of Bellarena, Downhill, Castlerock and Benone beach. The area has been classified as both an Area of Special Scientific Interest and as an Area of Outstanding Natural Beauty. The total area of the AONB is 138 km².