There are four main islands and seven motus or islets in the Rakahanga lagoon. The northern island is divided into three: Tetukono in the north and northeast, Tetaha Kiraro in the west, and Paerangi in the southwest; while the southern island is Rakahanga. The motus are: on the east, Te Motu o Umurua, Akaro, Motu Ngangie, Huananui, Motu Mahuta and Motu Okakara; while on the southwest side the islet of Te Kainga guards the widest passage into the lagoon. The north-east coast has sandy beaches. The west coast is rubble and beach rock (a conglomerate of coral and shell) over old reef rock. The atoll is densely vegetated with coconut palms.