 The most significant islands are Moneron, Rebun, Rishiri, Okushiri, Ōshima, Sado, Okinoshima, Ulleungdo, Askold, Russky and Putyatin.The shorelines are relatively straight and are lacking large bays or capes; the coastal shapes are simplest for Sakhalin and are more winding in the Japanese islands.The largest bays are Peter the Great Gulf, Sovetskaya Gavan; Vladimira Bay, Olga; Posyet Bay in Russia; East Korea Bay in North Korea; and Ishikari (Hokkaidō), Toyama (Honshū), and Wakasa (Honshū) Bays in Japan.