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plural oases or (rare, sometimes proscribed) oasises
A spring of fresh water, surrounded by a fertile region of vegetation, in a desert. quotations examples
It was the Lost Oasis, the Oasis of the vision in the sand. […] Deep-hidden in the hollow, beneath the cliffs, it lay; and round it the happy verdure spread for many a rood. […] Yes, the quest was ended, the Lost Oasis was the Found!
1892, James Yoxall, chapter 7, in The Lonely Pyramid
On the edge of the dunes lies the oasis town of Dunhuang, a key strategic crossroads on the Silk Road as the routes divided to the west to skirt the Taklamakan to the north and south.
2015, Michael Welland, “Barriers and Corridors, Imports and Exports”, in The Desert: Lands of Lost Borders, Reaktion Books, page 317
(figuratively) A quiet, peaceful place or situation separated from surrounding noise or bustle. quotations examples
[T]here is no true American music but the wild sweet melodies of the Negro slave; the American fairy tales and folklore are Indian and African; and, all in all, we black men seem the sole oasis of simple faith and reverence in a dusty desert of dollars and smartness.
1903 April 18, W[illiam] E[dward] Burghardt Du Bois, “Of Our Spiritual Strivings”, in The Souls of Black Folk: Essays and Sketches, Chicago, Ill.: A[lexander] C[aldwell] McClurg & Co., pages 11–12