Geography
The islands are of volcanic origin with basement rocks forming between the late Cretaceous and early Eocene. Tectonic movements raised the seabed to allow coral building. The whole Rennell area is thought to have been initially deposited as coralline algal limestone and then dolotomized. This dolomitic reef complex is overlain by younger undolotomized reef limestone. The island is the second largest upraised coral atoll in the world. It is largely unmodified and includes the largest lake in the South Pacific.
The island is about one hour's flight in a twin engine prop aircraft south of Honiara. It is almost totally surrounded by 120–150m cliffs, with the eastern end dominated by a large lake, while the western end is relatively flat with rolling forested hills. One road, known as the Copperhead Road, traverses the length of the island from the Tigoa airstrip in the west to the Labagu port area in the south, with a branch heading east towards the lake.
Read more about this topic: Rennell Island
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