Island range

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An island range is a mountain range that exists in total or almost total isolation from a larger chain of ranges and sub-ranges. From a distance on the plains, these ranges appear as "islands" of higher ground. And so, often described as an island of mountainous land because they exist in the "sea" of lower elevation and flatter prairie country, many examples are found in the northern Rocky Mountains of the United States. Island ranges include the Big Snowy Mountains of east-central Montana and the Crazy Mountains of south-central Montana.[1] Island ranges, due to their isolation, often have animal and/or plant species or subspecies found nowhere else.

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