Avroman has many springs and rivers that most their water mainly flows into Sirwan River. Bil spring (or Kani Bil) is one of these springs which has a discharge about 3000-4000 liters per second. The river which is made of Bil spring is the shortest river in the world with a total length of 15 meters. Construction of Darian Dam on the Sirwan River between 2009 and 2015 initiated The Darian Dam Archaeological Salvage Program that led to discovery of many archaeological sites before flooding of the reservoir.