Boven-Digoel was a prison camp in the Dutch East Indies in which Indonesian nationalists and communists were interned between 1928 and 1942. The site was located at the source of the Digul in an isolated area of New Guinea , surrounded by hundreds of kilometers of jungle populated by hostile tribes. Among those interned in this camp, there was Marco Kartodikromo , Mohammad Hatta or Sutan Sjahrir .