Subarea (noun)

1. A smaller region or area that is a part of a larger one.
2. A specific or distinct area that falls within the boundaries of a larger area.

Origin:

From the latin word "sub" meaning under and "area" meaning a region or an extent of land.

Examples:

1. The city was divided into several subareas for the purpose of urban planning.
2. The forest was divided into subareas for recreational use.
3. The subarea of the city was designated for residential use.
4. The subarea of the park was closed for maintenance.
5. The subarea of the lake was designated for swimming and boating.