Heart of Borneo (HoB) is an initiative of Brunei Darussalam, Indonesia and Malaysia based on the principles of conservation and sustainable development for the tropical highland forests in Borneo. The HoB initiative's goal is to preserve and maintain the sustainability of one of Borneo's best remaining rain forests, for the welfare of present and future generations. Heart of Kalimantan or Jantung Kalimantan is Indonesian part of the HoB.

The HoB area covers approximately 23 million hectares of ecologically connected forest across three countries. A large portion of this land – of which 72% is dominated by tropical rain forests – is located in Indonesia.

HoB area's seven main characteristics and functions are forest cover, mega biodiversity, water tower catchment, altitude regions, carbon storage, social and cultural preservation and ecotourism. One of HoB's vital functions is as a water tower or catchment area which includes 14 of the 20 main rivers – such as the Barito, Mahakam and Kapuas Rivers – on the island.

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