Maldives consists of 1,192 coral islands grouped in a double chain of 26 atolls, along the north-south direction, spread over roughly 90,000 square kilometres (35,000 sq mi), making this one of the world's most dispersed countries. It lies between latitudes 1°S and 8°N, and longitudes 72° and 74°E. The atolls are composed of live coral reefs and sand bars, situated atop a submarine ridge 960 kilometres (600 mi) long that rises abruptly from the depths of the Indian Ocean and runs north to south. Only near the southern end of this natural coral barricade do two open passages permit safe ship navigation from one side of the Indian Ocean to the other through the territorial waters of Maldives. For administrative purposes the Maldivian government organised these atolls into twenty one administrative divisions. The largest island of Maldives is Gan, which belongs to Laamu Atoll or Hahdhummathi Maldives. In Addu Atoll the westernmost islands are connected by roads over the reef (collectively called Link Road) and the total length of the road is 14 km (9 mi).
Maldives is the lowest country in the world, with a maximum natural ground level of only 2.4 metres (7 ft 10 in), with the average being only 1.5 metres (4 ft 11 in) above sea level, although in areas where construction exists, this has been increased to several metres. However, more than 80 per cent of the country's land is composed of coral islands that rise less than one metre above sea level.