Borneo is a location in Uncharted 2: Among Thieves; it is the third largest island in the world and is located to the north of Australia. Its landscape is largely jungle. While north Borneo is Malaysian, the rest of the island is Indonesian.
In the 13th Century, Marco Polo and his fleet of 13 ships were shipwrecked on the island.
Uncharted 2: Among Thieves
In Uncharted 2: Among Thieves, Nathan Drake arrives at Borneo to search for clues of where the Cintamani Stone could be. He is accompanied by Victor Sullivan and Chloe Frazer. Also in Borneo is Zoran Lazarević, who is searching for Polo's lost fleet. After infiltrating Lazarević's camp, Drake soon realizes that Polo must have fled to high ground, to avoid a tsunami. They discover an underground temple, filled with dead bodies and blue resin, as well as the Phurba Dagger.
Uncharted 3: Drake's Deception
In the non-canon mission Nate, Sully and Chloe infiltrate Lazarević's camp to discover what are in Draza's crates. After collecting the four pieces of the Janus head, having killed Draza, they travel to London.
Located high up in a mountain, the caverns were last occupied by Marco Polo's crew, who had drank the resin. The caverns consist of three main rooms. One is the largest, which is littered with blood and human skeletons. The second is filled with barrels that contain blue resin. The third is concealed behind a damaged wall and contained the Phurba.