Fig. 2. Four classified risk zones were mapped in association with the average percentage risk (APR) of being impacted by oil spills in marine areas of the 23 coastal provinces along with the appearances of 15 important resources including zone 1: low risk (APR: 0.91–15.71%), zone 2: moderate risk (APR: 15.72–30.51%), zone 3: high risk (APR: 30.52–45.30%), and zone 4: very high risk (APR: 45.31–60.10%; from Songkran, 2013).