Kalimantan is the Indonesian part of the island of Borneo, known for its vast rainforests and diverse wildlife. It is the third-largest island in the world and is rich in natural resources, including timber and minerals. The region is home to various ethnic groups, each with its own unique culture and traditions. The island is also significant for its environmental importance, as it houses many endangered species, such as the Bornean orangutan. Efforts are ongoing to protect its ecosystems from deforestation and habitat loss, which threaten both wildlife and indigenous communities.