Koko Head is the headland that defines the eastern side of Maunalua Bay along the southeastern side of the Island of Oahu in Hawaii. On its western slope is the community of Portlock, a part of Hawaiʻi Kai. Koko Head (at 642 ft or 196 m) is an ancient tuff cone that is somewhat dwarfed by its neighboring tuff cone, Koko Crater, with its peak, Kohelepelepe (or Puʻu Mai), rising to 1208 ft or 368 m. Koko Head itself has three significant depressions or old vents, the largest of which forms the well-known Hanauma Bay. Koko Head's last eruption was 30,000-35,000 years ago and it is part of the Honolulu Volcanics.