Matua (Russian: Матуа, Matsuwa Japanese: 松輪島; Matsuwa-tō) is an uninhabited volcanic island near the center of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean, 16 kilometers (9.9 mi) across Golovnin Strait from Raikoke. Its name is derived from the Ainu language, from “hellmouth”.
Matua was visited by hunting and fishing parties of the Ainu, but there was no permanent habitation at the time of European contact. The island appears on an official map showing the territories of Matsumae Domain, a feudal domain of Edo period Japan dated 1644, and these holdings were officially confirmed by the Tokugawa shogunate in 1715. Subsequently claimed by the Empire of Russia, sovereignty initially passed to Russia under the terms of the Treaty of Shimoda, but was returned to the Empire of Japan per the Treaty of Saint Petersburg (1875) along with the rest of the Kuril islands. The island was formerly administered as part of Shimushiru District of Nemuro Subprefecture of Hokkaidō.