Matanuska Glacier is in the US state of Alaska. It is 27 miles (43 km) long by 4 miles (6.4 km) wide and is the largest glacier accessible by car in the United States. It is just two hours’ drive north east of Anchorage and can be seen from many points along the road.

It is classified as a valley glacier being a body of solid ice that flows like a river under its own weight through an existing valley. It originates from within the Chugach mountain range of South Central Alaska and flows at a rate of about 1 foot (30 cm) per day to its terminus at the Matanuska River. It takes approximately 250 years for the ice to form at the top of the glacier and advance all the way to the terminus.

The blueness of glacial ice is caused by its density which allows the entire spectrum of light to be absorbed with the exception of the blue light which is reflected.

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