Introduction to the Pan-Pacific Glacier: The Pan-Pacific Glacier is a retreating glacier. When Muir arrived in 1879, it had retreated about 24 kilometers northward; in 1999, its length was about 40 kilometers and its width was about At 2,300 meters and about 100 meters high, it is the most magnificent sea glacier in Glacier Bay National Park, crossing the border between Alaska, USA, and British Columbia, Canada. Currently, the surface of the glacier is covered with a large amount of sediment brought from the upper reaches, making it slightly gray.