"expanses" in the noun sense
1. sweep, expanse
a wide scope
"the sweep of the plains"
2. area, expanse, surface area
the extent of a 2-dimensional surface enclosed within a boundary
"the area of a rectangle"
"it was about 500 square feet in area"
3. expanse
a wide and open space or area as of surface or land or sky
Source: WordNet® (An amazing lexical database of English)
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