Ostrov Matua (Matsuwa To) (48°05'N., 153°12'E.) is a conical active volcano, continuously emitting white smoke. The long slope extending SE from the summit terminates in low hills and terraces, S of which is a sandy beach. The SE extremity of the island is fringed by reefs and islets extending about 0.5 mile S. The largest islet is 29m high. From a point 2 miles W of the SE extremity, a reef, awash in places and covered with kelp, extends about 1 mile S.

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