Gas was sampled in April 1998. The northern coastline is dominated by a rocky shoreline, with the sandy beach limited to the southern part of the island. Settlements proliferate in the area fronted by the sand beach. Like in the other islands, shore erosion seems to be very active. Beach attrition has already affected a number of houses and the barangay hall.
Agriculture is done in woody areas.
There is a sizeable coconut plantation. Fresh water is present in the form of shallow groundwater. It is characterized by an expansive beach flat at the southern part and a rolling to gently sloping hill in the north. It is volcanic in origin, later enlarged by the deposition of the coastal plain at the southern part. The hill is moderately steep.