Lava caves usually form in smooth lava flows. As the lava is emitted from the vent area, it spreads in the path of least resistance. The outer layers of the lava harden, while the interior forms horizontal conduits that channel the advance of the flow. These conduits are the beginning stages of lava caves that serve to insulate the heat from the lava which then provides a way for the lava flow to advance longer distances. The cave types/shapes formed depend on the slope, terrain, and lava viscosity. Ruhengu cave is very long and has partitions as one goes deep inside; no one has ever walked up to its end point! It is inhabited by bats and birds. Local people collect water from the cave during the dry seasons. Caves are believed to be hiding places for Batwa during wars; a place where they would go to remobilize themselves.
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