expanse

英[ɪk'spæns;ek-] 美[ɪk'spæns]

1. a wide scope;

"the sweep of the plains"

2. 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. a wide and open space or area as of surface or land or sky