Indus River Dolphin Sindh, Pakistan. The Indus river Dolphin or Indus blind Dolphin (Platanista minor) world's rarest animal found in the freshwater of the Indus River near Sukkur town in the Sindh province of Pakistan. Dolphin locally known as “Bulhan” occurs only in the Indus river. The estimated remaining population of Indus river Dolphins is