A map of Durn. Lake Wren can be seen to the southeast of Mount Heldeofol.
Lake Wren is located to the southeast of Mount Heldeofol.
Runoff from orc activity at the Mount Heldeofol is responsible for polluting the eastern fork of the river that feeds into the lake. This, along with the copper mining runoff in the western fork of the river, has led to Lake Wren becoming heavily polluted.