Ioánnina Lake (also known as Lake Pamvótis) is contained in a depression lined with alluvium. It collects the waters flowing down from Mount Mitsikéli to the north, and its level varies according to the seasons and the outflow of the swallow holes (katavóthres), worn through the soft limestone around the shore. It is marshy in the northern part, but in the south it reaches 12m in depth; it is liable to sudden storms. The shady walk along its banks beneath the citadel provides a pleasant view of the lake and island.