The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Todoko-Ranu Volcano in north-western Halmahera 15 km SW of Gamkonora volcano is a part of a larger volcanic complex, which contains 2 calderas. One of the calderas, Ranu caldera, contains a crater lake.
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