The Digul (Dutch: Digoel) is a major river in southern Papua province, Indonesia, on the island of New Guinea.
The swamplands upstream were known by the name "Boven-Digoel" (Above the Digul, in Dutch) and hosted a penal colony at Tanahmerah (Red Earth) in the early 20th century, when Indonesia was a colony of Holland. As a result of the abortive 1926 revolt by the Communist Party of Indonesia (PKI), the Dutch exiled 823 of the most troublesome revolutionaries here.
Rising on the southern slopes of Maoke Mountains, the Digul flows first south and then west to empty into the Arafura Sea. For much of its length it travels across a low region of extensive swamps and creates a delta near Dolak (Frederik Hendrik) Island. The river has a length of 525 kilometres (326 mi) and is navigable as far as Tanahmerah.