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A coteau is a geological term referring to a steep-sided hill or ridge formed by the erosion and deposition of sedimentary rock, typically found in areas with rolling plains or prairies. Coteaus often have a flat or gently sloping top with steep sides, and are commonly located in regions with a history of glaciation or fluvial activity. These landforms can provide important habitat for a variety of plant and animal species, and are often associated with unique ecosystems and biodiversity.