Fergusson is the largest island in the group and the highest peak is 2073m, with two other lower ranges from which the island's many rivers and streams flow. It is notable for its hot springs, bubbling mud pools, spouting geysers and extinct volcanoes. The hike from Warluma to the caldera of Mt Lamanai takes about 1½ hours and affords fantastic views over an immense crater. Take a local guide (ask around to arrange for one).
Particularly active thermal springs can be found at Deidei, opposite the main town of Salamo.
