In which countries is the island of Borneo?

Player #53553731, It was leased to Malaysia by the Sultan of Sulu. Malaysia then refused to give it back when Malaysia gained independence from the British.

My answer was correct then. Think about it.

this question would have made more sense if it had asked "what countries are on the island of Borneo"

In Indonesia Borneo is called Kalimantan. On this island will be established the new capital city of Indonesia.