The Nanatsujima islets are a group of uninhabited small islands with a collective land area of 24 ha. They lie in the

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it h ...

about 20 km off the northern tip of the

Noto Peninsula The Noto Peninsula (能登半島, ''Noto-hantō'') is a peninsula that projects north into the Sea of Japan from the coast of Ishikawa Prefecture in central Honshū, the main island of Japan. The main industries of the peninsula are agricultur ...

Ishikawa Prefecture is a prefecture of Japan located in the Chūbu region of Honshu island. Ishikawa Prefecture has a population of 1,140,573 (31 October 2019) and has a geographic area of 4,186 km2 (1,616 sq mi). Ishikawa Prefecture borders Toyama Prefecture to ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. The archipelago comprises two islet groups; a northern group (Tatsujima, Ohshima and Karimatajima), and a southern group (Akashima, Aramikojima, Eboshijima and Mikuriyajima). They are composed of volcanic rocks, either

andesite Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predomi ...

tuff Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock cont ...

breccia. The largest islet, Ohshima, has a land area of 12.6 ha with its highest point 62 m above sea level. The other islets have almost perpendicular cliffs about 40 m in height.

Important Bird Area

The islands and their surrounding waters have been recognised as an

Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ...

(IBA) by

BirdLife International BirdLife International is a global partnership of non-governmental organizations that strives to conserve birds and their habitats. BirdLife International's priorities include preventing extinction of bird species, identifying and safeguarding ...

because they support breeding

colonies In modern parlance, a colony is a territory subject to a form of foreign rule. Though dominated by the foreign colonizers, colonies remain separate from the administration of the original country of the colonizers, the '' metropolitan state'' ...

Japanese murrelet The Japanese murrelet or crested murrelet (''Synthliboramphus wumizusume'') is a small seabird in the auk family that occurs along the remote rocky coasts and in the offshore waters of Japan, and may also be found after the breeding season as far ...

References

Important Bird Areas of Japan Seabird colonies Islands of Ishikawa Prefecture Uninhabited islands of Japan {{Ishikawa-geo-stub