With increasing altitude vegetation becomes more varied and abundant, until the tree limit is reached; then follows a forest belt, which in the highest mountains is limited above by cold as it is below by aridity.

There was nothing to see at this altitude, but he wasn't seeing anything in the book anyway.

But during the summer, temperatures are affected as much by altitude as by latitude, and the coast is cooled at night by breezes from the Gulf.

At the foot of this range there is, relatively speaking, a depression, with an altitude of about 3850 feet.

It is one of the highest mountains of Africa, its highest peak reaching an altitude of 17,007 feet.