Cefn Bryn is an ancient ridge in Britain. It is a 5-mile-long Old Red Sandstone ridge in south Wales, in the heart of the Gower Peninsula, in the City and County of Swansea. Local people colloquially refer to it as the "backbone of Gower", as it protrudes from surrounding limestone. The highest point on the ridge (188m/617 ft ) is the second highest point in the peninsula, offering panoramic views of the surrounding country and seas. The swathes of grassland around the ridge are known as Cefn Bryn Common.