In the winter , they are most common in the Kuskokwim Delta , St. Matthew Island , and at the southernmost portion of St. Lawrence Island .
Alaska 's polar bear populations are concentrated along its Arctic coastlines .
In the winter , populations are most common in the Kuskokwim Delta , St. Matthew Island , and at the southernmost portion of St. Lawrence Island .
Alaska 's polar bear populations are concentrated along its Arctic coastlines .