 There is also a small beach at Tintagel Haven immediately north of the castle, as well as a cave known as Merlin's Cave under the castle.A stream called the Trerammett River flows from Treven to Tintagel Haven.The cliffs from Backways Cove, south of Trebarwith Strand to Willapark just to the south of Boscastle are part of the Tintagel Cliffs SSSI (a Site of Special Scientific Interest), designated for both its maritime heaths and geological features.