Barangay Casoy nestles in a low lying area in the town proper of the Municipality of Catarman, Provincial of Northern Samar.

Perhaps this place is strategically located along the creeks of Maroyondoyon river. The narrow strip of land of the barangay was remarkably a vantage point of the farm land owned by the Bandal family of which at present was eventually donated by them to the barangay.

Being situated along the creeks of Maroyondoyon river, it develop a constant threat of flooding, everytime the rain pours heavily to massive uneven flows of water of which some of the pathway become impassable to barangay residents.