Todoko-Ranu is a twin
caldera
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ...
complex on Halmahera island, Indonesia. The 2 km wide of lava-filled Todoko caldera is at the south of the 2 × 2.8 km wide of Ranu caldera. The Ranu caldera contains a volcanic cone Sahu and a caldera lake at the north side. No historical records are found from the caldera complex.
See also
* List of volcanoes in Indonesia
References
{{Authority control
Active volcanoes
Mountains of Indonesia
Volcanoes of Halmahera
Volcanic crater lakes