This stretch now forms part of the main line from Brisbane to the western interior.

As the seaway withdrew a coastal plain expanded southward into the northern part of the western interior.

The widespread Spizella passerina arizonae is associated with mountains and arid habitats of the western interior.

Mokala is the Setswana name for the magnificent camel thorn, a tree species typical of the arid western interior and common in the area.

The hilly western interior of Massachusetts has the coldest winters.

Both daily and seasonal variation in temperature are greatest in the western interior and lowest along the coast.

The western interior is largely arid Karoo, while the east is well-watered and green.

A similar craterlet lies across the western interior of the rim.

The subspecies of the western interior have the darkest upperparts, and eastern S. c. carolinensis has the palest back.

There is a low ridge in the western interior, but the remainder of the floor is relatively level.