Definition
1 - Plains - refers to an extensive area of land having few inequalities of surface; usually with very few trees or none at all.
2 - Upland - refers to highland areas; ground elevation above the lowlands along rivers or between hills.
3 - Mountainous - refers to areas having mountains
4 - Coastal - refers to areas located on or near a coast; land next to the sea and seashores.
5 - Others (specify) - refers to other areas (if any) other than those enumerated above.