 The Longships, a group of rocky islets are just over offshore, and together with the Seven Stones Reef and the Isles of Scilly which lie about southwest — are part of the mythical lost land of Lyonesse, referred to in Arthurian literature.The cliffs are made of granite, an igneous rock, which means they are resistant to weathering, and have steep cliff faces.There are two varieties of granite represented at Land's End.