What is "savannas"

Usage examples of "savannas".

Alleghanies to the bare peaks of the Rocky Mountains--a region of savannas and forests, sun-cracked deserts, and grassy prairies, watered by a thousand rivers, ranged by a thousand warlike tribes.

An enormous lioness, twice as large as any feline who would populate savannas far to the south in a much later age, had been stalking the herd.