Borneo is the largest island in Asia and the third largest island in the world. Most of the island is part of Indonesia (known as Kalimantan) but much of the northern shoreline is part of Malaysia and there is also the tiny Kingdom of Brunei that is only 1% of the land area of Borneo. Borneo is on the Asian side of the Wallace line and provides a contrasting site to the long term Opwall research site in Sulawesi in the Wallacea region. The Opwall expeditions are run in East Kalimantan with the first week in the Lesan Conservation Forest south of Berau. After the first week, the group will travel to Derawan Island which involves a 2-hour bus transfer and a 2-hour boat ride.