The Aiud or Aiudul de Sus (Hungarian: Enyed-patak) is a left tributary of the river Mureș in Transylvania, Romania.[1][2] It discharges into the Mureș in Aiud.[3] The upper reach is also known as Siloș. Its length is 27 km (17 mi) and its basin size is 182 km2 (70 sq mi).[2]