Sufi Chay (Persian: صوفیچای) is a river in north-west Iran, at 37° 19' 45" N, 46° 4' 36" E. The river rises at Mount Sahand[1] in the mountains to the east of Lake Urmia, and flows south past Alavian and Senshon till it reaches Maragheh city where it turns east and enters the endorheic Lake Urmia in a large delta at Bonab.[2]