What is the Indonesian state located on Borneo Island?

The Indonesian state located on Borneo Island is Kalimantan. Borneo is the third-largest island in the world, and it is shared by three countries—Indonesia, Malaysia, and Brunei. In the case of Indonesia, the Kalimantan region encompasses about 73% of the island's land area. This area is known for its rich biodiversity, tropical rainforests, and significant indigenous cultures.

Sumatra, Java, and Sulawesi are all distinct islands in Indonesia, each with their own geographical and cultural characteristics. Sumatra lies to the west of Borneo and is known for its rugged terrain and volcanic activity. Java, the most populous island in Indonesia, is located to the south of Borneo and is the political and economic center of the country. Sulawesi, located to the east of Borneo, is known for its unique shape and diverse marine life. Thus, Kalimantan is the only choice that specifically refers to the Indonesian part of Borneo Island.