Which of the following is not a type of region discussed in this text?
a. space region (deep region)
b. vernacular region (perceptual region)
c. formal region (uniform region)
d. functional region (nodal region)

A. Space region (deep region)

Explanation:

All the region correspond to some sort of the region like the formal region is uniform in characteristics and it may be in the form a state, or specific area, etc. A functional region is a region of specific functions like the economic region or any region with some purpose if activity. It is called a nodal region or node point from where all services or routes radiate. The vernacular region this region is a cultural region based on the cultural characteristics of the areas as some parts of the area may be politically or culturally active or connected historically, share=ing the same common bond of identity. Out of these three, the space region is different as all these are formed on the surface of the earth and the outer space or deep region as given in the text is not that type of region.