There is a rich evidence of previous glaciation in the highest parts of the mountains as glaciers covered the mountains and created its cirque-shaped lakes and depressions. There are at least eight glacial lakes across the mountain range. The eastern edge of the mountain gives rise to several rivers amongst them the third longest river of the country, the Shkumbin. The western and southern edges of the mountain are drained by Devoll, which has formed a deep gorge between the mountains.