The Ostrobothnian Plain or Pohjanmaa is a large lowland in

Finland Finland ( fi, Suomi ; sv, Finland ), officially the Republic of Finland (; ), is a Nordic country in Northern Europe. It shares land borders with Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of B ...

along the

Bothnian Sea The Bothnian Sea ( sv, Bottenhavet; fi, Selkämeri) links the Bothnian Bay (also called the Bay of Bothnia) with the Baltic proper. Kvarken is situated between the two. Together, the Bothnian Sea and Bay make up a larger geographical entity, t ...

being arguably the largest plain in the Nordic countries. The plain is made up smaller individual

sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class o ...

and

clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay par ...

plains alternated with rivers and

peat bog A bog or bogland is a wetland that accumulates peat as a deposit of dead plant materials often mosses, typically sphagnum moss. It is one of the four main types of wetlands. Other names for bogs include mire, mosses, quagmire, and muskeg; a ...

s. It extends as a 100 km wide and 257 km long belt along the northwestern coast of Finland. The plain is extremely flat with height differences never exceeding 50 m. Geologically the plain is a continuation of the Sub-Cambrian peneplain found across much of Fennoscandia.

References

{{coord missing, Finland Landforms of Ostrobothnia (region) Landforms of North Ostrobothnia Plains of Finland