What is the crevasse or series of crevasses, usually deep and often broad, frequently occurring near the head of a mountain glacier, about where the névé field joins the valley portion of the glacier called?

bergschrund — The crevasse or series of crevasses, usually deep and often broad, frequently occurring near the head of a mountain glacier, about where the névé field joins the valley portion of the glacier. (Webster's 1913.)

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