An ice tongue is formed where a valley glacier moves quickly out into the ocean or a lake from the land and over water.The Drygalski ice tongue is a glacier in Antarctica, located on the Scott Coast, in the northern part of McMurdo Sound of Antarctic Ross Dependency, ~240 km from Ross Island.It was discovered in 1902 by Robert Falcon Scott and is thought to be at least 4000 years old.Prior to 2005 it stretched ~70 krn out to sea.Drygalski is a floating extension of David Glacier in the zone of Terra Nova Bay in the Ross Sea, one of the largest floating objects in the world, and contains ice that first fell as snow on the ice sheet thousands of years ago.It drains an area of the East Antarctica plateau measuring 224,000 km2.The supply of the David Glacier-Drygalski Ice Tongue comes from two main flows, a northern one from the Talos Dome and a southern one from Dome C.The importance of this glacier is due to the fact that it is the most massive drainage glacier in the Victoria Land part of East Antarctica sector.In addition, the ice tongue forms the southern coastline of TNB and plays a crucial role in the persistent development of the TNB polynya.In March 2005-2006 the giant 120 km long iceberg known as B 15A collided with the end of the ice tongue breaking off two large (70 km2) pieces.A year later in March 2006 another giant iceberg known as C 16 broke another piece off of around 100 km2 in size.