Meanings of occasional oases in English

The interior, except for occasional oases, is a desert, inhabited only by wandering tribes.

Yet even the Celestial Mountains and the Roof of the World boast occasional oases and foothills where life can flourish.

This so-called lake is now merely a flooded morass and the basin is a desert with occasional oases lying chiefly near its edges.

The bottom of the ocean, a monotonous desert of mud and sand, the accumulated sediment of hundreds of centuries, has occasional oases of strange vegetation.