Beru is part of a larger
reef, some long (NW-SE) and wide at the widest point (NE-SW). The center of the reef is a shallow
depression called Nuka Lagoon. The land mass occupies fully a third or more of the shallow reef structure and is positioned mostly towards the northeast edge of the reef. In maximum dimension the islet is long, and varies in width between and . Extensive spit development has created the nearly enclosed Tabiang Lagoon at the north end where
mangroves are present. A small lagoon or barachois at the northern tip is surrounded by man-made fishponds to hold
Milkfish, as is a similar feature at the south end of the islet. A long
barachois with extensive mangroves occupies the interior south of Nuka Lagoon. A causeway is present across the inlet mouth and a landing strip is present on the interior flats. The Nuka Lagoon, has a broad passage entering it. The island is east of
Tabiteuea Atoll and southeast of
Tarawa Atoll and is located near the
equator (1°20' S latitude). The closest island to Beru is the island of Nikunau. The island is served by
Beru Island Airport. ==Settlements==