ex ‧ panse /ɪkˈspæns/ BrE AmE noun [countable]
a very large area of water, sky, land etc
expanse of
an expanse of blue sky
vast/wide/large etc expanse
the vast expanse of the ocean
ex ‧ panse /ɪkˈspæns/ BrE AmE noun [countable]
a very large area of water, sky, land etc
expanse of
an expanse of blue sky
vast/wide/large etc expanse
the vast expanse of the ocean
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012