Samosir, or Samosir Island, is a large volcanic island in Lake Toba, located in the north of the island of Sumatra in Indonesia. Administratively, Samosir Island is governed as six of the nine districts within Samosir Regency. The traditional occupation of the Batak was agriculture, hunting and farming. The great lake of Toba provided vast opportunity for freshwater aquaculture since ancient times. Interior rural Batak communities relied heavily on rice farming, horticulture and other plant and commercial crops, and to some extent, acquiring forest products, such as hard wood, plant resin, and wild animals. The port of Barus on the western coast of Batak lands has become famous as the source of kapur barus (camphor). In ancient times, Batak warriors were often recruited by neighboring Malay courts as mercenaries. In the colonial era, the Dutch introduced commercial cash crops, such as coffee, sawit palm oil, and rubber, converting some parts of the Batak land into plantations.