Which is the longest saltwater lagoon in the world?

Marovo Lagoon is a large saltwater lagoon that is part of the New Georgia Islands in the South Pacific Ocean, within the sovereign country of the Solomon Islands. As it is the longest saltwater lagoon in the world that has an area of about 700 square km (270 square mi), and the two major islands that surround it are Vangunu and New Georgia.

Protected by a double barrier reef system, there are plenty of islands that are inhabited, however, some of them are isolated and there are no people at all. The border of Marovo Lagoon to the north consists of 130 km (81 mi) of that same raised barrier reef system with about 100 individual islands along its length, and there is a small third volcanic island, the Gatakae Island, that surrounds the southern side of the lagoon.

The lagoon is a popular destination for diving and is a tourism hub for travelers from Australia, New Zealand, Europe and the United States.

You can travel to the Lagoon from the capital city of Solomon Islands, Honiara in 1 hour on a twin otter plane or 10 hours on a weekly ferry.