ANSWER: Only 2
Explanation:
Apart from its coastline with the South China Sea, the country is completely surrounded on the three sides by the state of Sarawak, Malaysia. It lies on the Borneo Island. The Borneo Island is third largest island in the world and first in Asia. It has three countries in it - Parts of Malaysia and Indonesia and entire nation of Brunei along the northern part. Brunei has developed wealth from extensive petroleum and natural gas fields. Brunei has the second-highest Human Development Index among the Southeast Asia nations, after Singapore, and is classified as a "developed country".