South Stack Lighthouse of Anglesey for east-bound ships. It is followed by lighthouses, fog horns and other markers at North Stack, Holyhead Breakwater, The Skerries, the Mice, Point Lynas and at the south-east tip of the island Trwyn Du. The lighthouse is operated remotely by Trinity House. It has been visited by the team at "Most Haunted". Visitors can climb to the top of the lighthouse and tour the engine room and exhibition area. The lighthouse is open seasonally. <br> South Stack Lighthouse The South Stack Lighthouse is built on the summit of a small island off the north-west coast of Holy Island,
Geography of Wales Herefordshire and Gloucestershire lie to the east. Much of the border with England roughly follows the line of the ancient earthwork known as Offa's Dyke. The large island of Anglesey lies off the northwest coast, separated from mainland Wales by the Menai Strait, and there are a number of smaller islands. Most of Wales is mountainous. Snowdonia () in the northwest has the highest mountains, with Snowdon ("Yr Wyddfa") at being the highest peak. To the south of the main range lie the Arenig Group, Cadair Idris and the Berwyn Mountains. In the northeast of Wales, between the Clwyd Valley