Is it possible for a temperate forest/freshwater area to form within a desert?

I am imagining a temperate forested area with freshwater lakes, rivers, small mountains, and rolling grassy hills. This environment is situated within a very large explosion crater. Outside this crater is desert for miles in every direction. Under what conditions could such an environment develop and how would it be maintained (i.e., stopping the desert from "taking over")?

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Is it possible for a temperate forest/freshwater area to form within a desert?

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