The Sigatoka River is located in the island of Viti Levu

Viti Levu

Viti Levu is the largest island in the Republic of Fiji, the site of the nation's capital, Suva, and home to a large majority of Fiji's population.- Geography and economy :...

 in Fiji

Fiji

Fiji , officially the Republic of Fiji , is an island nation in Melanesia in the South Pacific Ocean about northeast of New Zealand's North Island...

 and has its source on the western side of Mount Victoria and flows for 120 kilometers to the coast between the central and western ranges. It is the chief means of transportation with some parts of the interior of the island.

The Sigatoka Sand Dunes

Sigatoka Sand Dunes

The Sigatoka Sand Dunes National Park is located at the mouth of the Sigatoka River on the island of Viti Levu in Fiji. They are located approximately 3km West of the town of Sigatoka....

are located at the mouth of the river.