Description
The three principal islands, from northwest to southeast, are Goodenough (Nidula), then across Moresby Straight to Fergusson (Moratau), the largest of the three, and across Dawson Straight to Normanby (Duau). In addition there are numerous small islands and reefs. Sanaroa and Dobu are the most significant of the smaller islands, while Sori or Wild is named for the HMS Challenger's artist, John James Wild. The highest peak in the group is the 2,536 metres (8,320 ft) Mount Vineuo on Goodenough Island.
The D'Entrecasteaux Islands are volcanic with a number of areas of volcanism and active geothermal fields. Fergusson island has three volcanic masses over 1,828 m high. There are geothermal areas in the south east area of Goodenough Island and the Bwabwadana and Iamalele on Fergusson Island. A particularly active hot springs is located at Deidei on Fergusson. Between Fergusson and Normanby Islands the Dawson Straights Group has several volcanic centres that may define a partly submerged caldera; one of the cones on southwestern Fergusson Island may have erupted in 1350. Geologically the islands are blocks of the Australian plate that were once thrust deep in to the Earth's crust by plate collision. Since then, the blocks have risen to emerge as tall domed structures draped in pieces of the sea floor.
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