14. Energy resources. Viet Nam has significant energy resources, with proven reserves of 615 million tons of crude oil, 600 billion cubic meters (m3) of natural gas, and 5,883 million tons of coal (Asia Pacific Energy Research Centre 2011). It is the third largest petroleum producer in Southeast Asia after Malaysia and Indonesia. Most natural gas and petroleum production occurs off the southern coast of Viet Nam, although a recent discovery of 50 billion m3 of natural gas at the Hac Long field in the Red River Basin is leading to increasing development in the north of Viet Nam. The development of reserves located around the Spratly Islands is complicated by ongoing territorial disputes with the PRC.