The Sutlej River (alternatively spelled as Satluj River) (Hindi: सतलुज, Punjabi: ਸਤਲੁਜ, Sanskrit: शतद्रु (shatadru) Urdu:درياۓ ستلُج ) is the longest of the five rivers that flow through the historic crossroads region of Punjab in northern India and Pakistan. The Sutlej River is also known as Satadree. It is the easternmost tributary of the Indus River.