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Fast ice (also called land-fast ice, landfast ice, and shore-fast ice) is sea ice or lake ice that is "fastened" to the coastline, to the sea floor along , or to grounded icebergs.Leppäranta, M. 2011. The Drift of Sea Ice. Berlin: Springer-Verlag. Fast ice may either grow in place from the sea water or by freezing pieces of drifting ice to the shore or other anchor sites.Kovacs, A.and M. Mellor. 1974. "Sea ice morphology and ice as a geologic agent in the Southern Beaufort Sea." pp. 113-164, in: The Coast and Shelf of the Beaufort Sea, J.C. Reed and J.E. Sater (Eds.), Arlington, Va.: U.S.A. Unlike drift ice, fast ice does not move with currents and winds.
The width (and the presence) of this ice zone is usually seasonal and depends on ice thickness, topography of the sea floor and islands. It ranges from a few meters to several hundred kilometers. Seaward expansion is a function of a number of factors, notably water depth, shoreline protection, time of year and pressure from the pack ice. In Arctic seas the fast ice extends down to depths of , while in the Subarctic seas, the zone extends to depths of about . In some coastal areas with abrupt shelf and no islands, e.g., in the Sea of Okhotsk off Hokkaidō, tides prevent the formation of any fast ice. Smaller may contain only the fast ice zone with no pack ice (e.g. McMurdo Sound in Antarctica).
The topography of the fast ice varies from smooth and level to rugged (when submitted to large pressures). The ice foot refers to ice that has formed at the shoreline, through multiple freezing of water between ebb tides, and is separated from the remainder of the fast ice surface by tidal cracks. Further away from the coastline, the ice may become Anchor ice to the sea bottom—it is then referred to as bottomfast ice. Fast ice can survive one or more melting seasons ( i.e. summer), in which case it can be designated following the usual age-based categories: first-year, second-year, multiyear. The fast ice boundary is the limit between fast ice and drift ice—in places, this boundary may coincide with a shear ridge. Fast ice may be delimited or enclose pressure ridges which extend sufficiently downward so as to be grounded—these features are known as stamukha.
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