expanse
nounUK /ɪkˈspæns/
US /ɪkˈspæns/
A very large, flat area of land, water, or sky.
The eagle flew high above the wide expanse of the desert.
OTHER MEANINGS
2. A large, open area of space or surface.
The expanse of the ocean stretched to the horizon.
3. The quality of being wide or extensive.
The expanse of the valley amazed the travelers.
4. A continuous, unbroken surface or region.
A vast expanse of snow covered the fields.