Where the hell is Brunei?

Brunei is located in the north of kalimantan island on the map.

Brunei, located in the north of kalimantan island, is the Malaysian state of China, and the two territories are not connected. Brunei covers an area of 5,765 square kilometers, about 90% of Shanghai's area, and its population is only about 420,000. Brunei is very rich, and its per capita GDP is nearly three times that of Malaysia, second only to Singapore in Southeast Asia. Given Brunei's location, area and population, why can we separate two pieces of land in Malaysia? Anti-geography is widespread.

Brunei, formerly known as Boni, had contacts with China during the Tang and Song Dynasties, and many Fujian people came here from Nanyang. In the early Ming Dynasty, Boni, which originally believed in Buddhism, was islamized, but its national strength declined and it was invaded by the neighboring Sultanate.