The island, which is ice-free and oval shaped, 1.4 km (0.87 mi) wide by 1.7 km (1.1 mi) long, lies close off the south coast of the much larger King George Island, and marks the eastern side of the entrance to King George Bay. It has a shoreline of low cliffs, with a beach on the north coast providing access. There is a small lake in the north-east. It is capped by Deacon Peak, a basaltic scoria cone. Deacon Peak was last thought to be active about 300 years ago. Petrel Crater, a maar crater, is located on the east side of the island, and is thought to have last erupted in or around 1905.