It is hemmed in by bodies of water from all sides; on the north and east by the Sibuyan Sea; on the south by Tablas Strait and on the west by the sea that separates the Municipality from Concepcion.
The seat of government is at Poblacion which is 36 kilometers from Romblon, the seat of provincial government, 12 kilometers from Banton and the municipal district of Calatrava on the south; 42 kilometers from Concepcion and 69 kilometers from the nearest airport of Tugdan. The Poblacion is also the center of trade and commerce and the principal port of the municipality.
Total land area of the municipality is 5,789.68 acres.
The island-municipality of Corcuera has lowland areas (lowland slope ranges from 3% to 8%) which comprise about 40% of total land area. The remaining 60% is hilly with varying degrees of inclination ranging from 8% to 18% slope. Most of the lands are planted to coconuts and fruit-bearing trees and ideal pasture land for livestock. The coastal areas are dotted with alternating rocks and white beaches.
MAJOR SOIL TYPE
The Zamboanguita sandy loam is the major soil type in the locality which is suitable for vegetables, rice, coconuts, fruits and root crops.
The climate of Corcuera falls on type II with a long summer usually from November to April accompanied by northeasterly winds or Amihan. The rainy season is from May to October usually accompanied by the southwest monsoon or the Habagat as the locals call it.
INLAND WATER RESOURCES
Suba Bay, a 28 hectares body of water with an outlet which could be fenced and developed for fish, prawn and shrimp culture located between Mabini and San Roque. It can also be an ideal site for the establishment of a canning industry now that electric power is available.
There are also two (2) creeks located at Colong-colong which can be sources of water for agriculture through the construction of water impounding dams or reservoir.
EXISTING LAND USE
Agricultural 2,072 has.
Total Land Area 2,343 has.
Three hundred sixty-three (363) hectares are presently used for the production of lowland crops such as rice and corn and one thousand seven hundred ninety-nine (1,709) are planted to upland crops such as coconuts, bananas, vegetables and fruit trees. Thick mangroves constitute the 36 hectares of marsh land in Suba Bay.
Pasturing is done in the lowland areas after the harvest of rice, corn, and other crops. It is also done under the coconut trees because there is no available land for grazing of cattle, goats and other animals except in idle land which are just small portions.
From a distance, a quick glance of Simara shows that it seems to be teeming with plantations. But in reality agricultural productivity is low because of the lack of irrigation and lack of large bodies of fresh water.