Peel, Isle of Man castle on St Patrick's Isle, and a cathedral, seat of the Diocese of Sodor and Man (the diocese was founded when Mann was ruled by the Norse). Peel is on the west coast of the Isle of Man, on the east side of the mouth of the River Neb. To the north west is St Patrick's Isle, connected to the mainland by a causeway, and to the west across the river is Peel Hill. The A1 road connects Peel with Douglas. The A4 and A3 roads connect it with Kirk Michael and Ramsey. To the south of Peel is Castletown,
Geography of the Isle of Man the Ordovician period. There is a belt of younger Silurian rocks along the west coast between Niarbyl and Peel, and a small area of Devonian sandstones around Peel. A band of Carboniferous period rocks underlies part of the northern plain, but is nowhere seen at the surface; however similar age rocks do outcrop in the south between Castletown, Silverdale and Port St Mary. Permo-Triassic age rocks are known to lie beneath the Point of Ayre but, as with the rest of the northern plain, these rocks are concealed by substantial thicknesses of superficial deposits. The island has significant deposits of