Longyeardalen is a valley and ravine located in Svalbard, Norway. It runs up as a side valley of Adventfjorden, a bay of the island of Spitsbergen. Longyeardalen is located between the mountains of Platåberget and Gruvefjellet. The town of Longyearbyen is located in the lower portions of the valley, which is named for the American industrialist John Munroe Longyear. The river of Longyearelva runs through the valley.
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