Today we explored Glacier Bay, a long and wild embayment running 65 miles into the mainland at the northwestern corner of the Alaska Panhandle. The national park, together with connecting northward parks, preserves, and wilderness in both the US and Canada, comprise a UNESCO World Heritage Site. At 25 million acres, it is one of the largest contiguous wilderness areas on the planet. Formed by repeated advances and retreats of the Grand Pacific Glacier and its tributary glaciers, which are fed by massive ice fields in the surrounding coast ranges, the bay is a terrific area for wildlife and wild landscapes.