Standing between 50 and 200 m high, the Red Cliff (Sekiheki) stretches for approximately 1 km along the western coast of Chiburijima Island, the southernmost of the Oki Islands. Geologically speaking, the cliff is a cross-section view of a former volcano. The red color is thought to result from oxidation of iron contained in the lava, and the striped pattern is due to repeated eruptions. The dramatic Red Cliff is one of the most impressive coastal landscapes in the Oki Islands, and is the defining feature of the landscape of Chiburijima Island.