The Southeast Asian island of Borneo is politically divided among 3 countries.

The answer is true because the island of Borneo, located in Southeast Asia, is indeed politically divided among three countries. The northern part of the island belongs to the country of Brunei, which occupies a small portion of the island's coastline. The majority of Borneo is divided between two countries: Malaysia and Indonesia. The Malaysian part consists of two states, Sabah and Sarawak, located in the northern and western regions respectively. The Indonesian portion of Borneo is known as Kalimantan, covering the largest area of the island. Therefore, due to the territorial divisions, Borneo is politically divided among these three countries.