Goidhu Island lies in a small separate atoll along with Fulhadu and Fehendhu. Goidhoo Atoll (also Goidu or Goifulhafehendhu), Horsburgh Atoll in the Admiralty Chart, is separated from South Maalhosmadulhu by a six-mile-broad (9.7 km) channel. This atoll is oval in shape and small, its greatest length being 10 miles (16 km). The inner lagoon has a depth of 17 to 20 fathoms; it has a sandy bottom mixed with mud and clay. Unlike the lagoons of most small atolls of the Maldives, this lagoon is free from coral heads in its centre.