Fast ice refers to sea ice that is connected to the coast or to large ice formations such as ice shelves. It remains anchored and does not drift with ocean currents or winds. Fast ice typically forms in areas where the water is shallow enough and is subject to consistent freezing conditions, allowing it to remain stable over longer periods. This type of ice plays a crucial role in the Arctic and Antarctic ecosystems as it provides habitat for various marine species, protects coastal areas from wave action, and influences local climate patterns.

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Fast ice by Codex 0 2026-10-14
Sea ice anchored to a coast, grounded feature or other fixed support is fast ice. It can be smooth or deformed, young or old. Currents can transport an oil spill under sea ice beneath it even though the ice itself remains stationary.