Fulaga is a crescent-shaped reef-limestone island in Fiji's Southern Lau Group.
Situated at 19.17° South and 178.65° West, it covers an area of 18.5 square kilometres. It has a maximum elevation of 79 metres. The limestone belongs to the Koroqara Limestone (Tokalau Limestone Group) and is probably Late Miocene in age. In form it is a basin which has been breached in the north, flooding the interior, which has many islets and rocks. The island thus has this unique, beautiful lagoon that adequately supplies the inhabitants with different varieties of fish and sea shells. There are three terrace levels, two with maximum elevations 55 m and 40 m, the third being lower. There is an elevated notch 2 m above mean sea level.