LOCATION AND POLITICAL SUBDIVISION
The municipality of Mercedes has a total land area of 17,369 hectares or 173.69 square kilometers. It is roughly 7.49% of the province’s total land area, and 0.97% of the region’s total land area. (Table 1)
The combined area of Barangay Poblacion and Barangay San Roque, which are considered urban barangays constitute about 397.26 hectares or 2.29% of the municipal area. Other barangays that comprise the rural areas constitute about 16,971.74 hectares or 97.71%. The largest barangay is Barangay Colasi with an area of 2,551.80 hectares or 14.69% of the municipal area, while the smallest is Barangay 6 with an area of only 3.49 hectares which is 0.02%. (Table 2)
Moreover, the municipality’s municipal water covers around 53,850.731 hectares and its shoreline excluding offshore island is around 95,074.307 meters as delineated by the NAMRIA.