A region is a large area of land that is different from other areas of land, for example because it is one of the different parts of a country with its own customs and characteristics, or because it has a particular geographical feature.

The regions are the parts of a country that are not the capital city and its surrounding area.

You can refer to a part of your body as a region.

You say in the region of to indicate that an amount that you are stating is approximate.