Any of the muscles that are under our voluntary control (skeletal muscles) can cramp. Cramps of the extremities, especially the legs and feet, and most particularly the calf (the classic  charley horse ), are very common.
Northern Europe includes Denmark, Finland, Greenland, Iceland, Norway, and Sweden. This area is known for harsher environments. It is generally cold, has poorly developed soils and limited mineral resources. This region has a population of over 25 million people.
Introduction :: DENMARK. Background: Once the seat of Viking raiders and later a major north European power, Denmark has evolved into a modern, prosperous nation that is participating in the general political and economic integration of Europe. It joined NATO in 1949 and the EEC (now the EU) in 1973.