The Site of Special Scientific Interest (SSSI) at the head of Calgary Bay was formally designated on 30 June 1986, and comprises the beach, the dunes and the machair. The SSSI protects one of the few examples of sandy beach backed by shell sand dunes and machair on the Isle of Mull. Vehicular access, overnight camping, fires and sand extraction are not permitted within the SSSI. Day visitors may park within the designated parking area at the north side of the bay. Wild camping is permitted only in the designated area set aside at the south side of the bay, adjacent to the public toilets.