Beqa (pronounced Mbengga) lies 7.5 km south of Navua, the closest town on the Fiji main island of Viti Levu, separated by a 260 m deep marine passage. The entire Beqa Island covers 36 km2.

Beqa Island was formed as a strato-volcano 5 million years ago (while its satellite island Yanuca was formed as submarine volcano). Its conical form can still be seen on satellite or air photograph.

There is a fringing reef around the island and the barrier reef (68 km) around the lagoon of Beqa. They are both made up of colourful coral developed over hundreds of years.