Expanse

1.

(a wide area or extent, a large, open area) ផ្ទៃទូលំទូលាយ, សន្ធឹង, វិសាលភាព
Example: The blue expanses of the sky.

1.

That which is expanded or spread out; a wide extent of space or body; especially, the arch of the sky.

1.

area, extent, magnitude, measure, range, reach, scope, size

1.

To expand