In the western United States, an area called the Great Basin contains many freestanding mountain ranges that are separated from each other by high desert. These mountain ranges could be called

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The description of the mountain ranges as "freestanding" and "separated from each other by high desert" suggests that they are isolated and distinct environments, similar to islands in the middle of a surrounding sea. These areas are known as "islands of biodiversity" because they often have unique species and ecosystems that have evolved in isolation from surrounding regions.

In the Western United States, an Area Called the Great