Compiled using data from eleven national mapping agencies at data scales no larger than 1:200,000/1:250:000. Dataset was originally published in tiled Coverage format. Data has now been merged to a single dataset using ArcMap v10.8 and exported to shapefile and geopackage formats. A number of slithers were removed from the merged data where source tiles were adjacent. Each polygon has a surface attribute (CST00SRF) indicating the type of feature it represents, ie. ice shelf, ice tongue. Data sources are dated between 1956-1997.