Expanse
Expanse , noun
[From Latin expansus, past participle of expandere. See Expand.]
That which is expanded or spread out; a wide extent of space or body; especially, the arch of the sky.
The green expanse.
Lights... high in the expanse of heaven.
The smooth expanse of crystal lakes.
Expanse , transitive verb
To expand. [Obsolete]
That lies expansed unto the eyes of all.