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.
Denmark is a member of the European Union (EU); Danish legislation and regulations conform to EU standards on almost all issues. Danes enjoy a high standard of living and the Danish economy is characterized by extensive government welfare measures and an equitable distribution of income.