siek is a north german term for a wet depression, hollow or lowland area. it is mainly used to describe typical cultural landscape elements in eastern westphalia, especially in the county of lippe and in the region of ravensberg land. in east westphalia "siek" is a very common component of the names of tracts of land, roads, places and even personal names, e.g. "heidsiek", "siekhorst", "im siek", "siekmann" and "sieker".