The Sutlej (Punjabi: ਸਤਲੁਜ, also known as Satluj, is the longest of the five rivers of Punjab that flows through Northern India, with its source in Tibet near Mount Kailash. It receives the Beas River in the state of Punjab, India and continues into Pakistan to join Chenab river to form Panjnad river which furthur joins Indus river at Mithankot. Sutlej was known as Shatadru or Sutudri to Indians in Vedic period and Zaradros or Hesidros to Greeks.

The waters of the river are allocated to India under the Indus Water Treaty between India

There is substantial evidence to indicate that Sutlej was once an important tributary of the Sarasvati river, instead of the Indus river. Due to some natural tectonic convulsion of earth, Sutlej changed its course to join the Beas river. This resulted in drying of Saraswati, desertification of Cholistan and Sindh, and abandonment of numerous ancient human settlements along the Saraswati river.

pa:ਸਤਲੁਜ Satledź Sutlej