Oyster Rocks consist of a prominent group of islands and rocks. Devgad Island (Devgadgudda Island), 44m high to the tops of the trees, is the largest and highest island; it is bold, rocky, and steep-to on its W side.
Oyster Rocks Light, with a racon, is shown from a red round masonry structure, with white bands and a white cupola, on the summit of Devgad Island.
Mandal Island (Mandelgudda Island), 26m high, lies about 0.2 mile SW of Devgad Island; a 5.2m patch lies about 183m E of the island.
Karkal Island (Karkaigudda Island), 33m high and covered with jungle, lies close E of Devgad Island. East Island, a bare rock, 9m high, lies about 0.3 mile farther E. A 0.3m patch lies between Karkal Island and East Island.
During the Southwest Monsoon, anchorage can be obtained NE of Karkal Island (Karkaigudda Island), in 10m, soft mud, with Oyster Island Light bearing 248°, distant about 0.8 mile.
A rock, which dries 1.2m, lies close E of East Island; the sea breaks over this rock at HW. A detached shoal, with a depth of 2m lies close SE of this rock.