Fastest glacier

The fastest-moving glacier in the world is Jakobshavns Isbræ (Sermeq Kujalleq in Greenlandic), which is the largest outlet glacier in west Greenland, draining a catchment area of 110,000 square kilometres (42,470 square miles), or around 6.5% of the whole Greenland Ice Sheet. In the late 1990s, the glacier began to thin, accelerate and retreat in response to climate change, with the speed doubling to around 12.6 kilometres (7.8 miles) per year in 2003; that's an average of 35 metres (115 feet) per day. The glacier has continued to accelerate and, in summer 2012, it reached a record speed of 17 kilometres (10.6 miles) per year, equating to approximately 46 metres (151 feet) per day.

Although it cannot be verified, the Jakobshavns Isbræ glacier is widely believed to have produced the iceberg that sank the RMS Titanic in April 1912.

The Columbia Glacier, located between Anchorage and Valdez in Alaska, USA, was measured to be flowing at an average rate of 35 m (115 ft) per day in 1999 by glaciologists from the University of Colorado.