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.
Countries in the Schengen area are Austria, Belgium, Denmark, Finland, France, Greece, Italy, Luxembourg, Germany, the Netherlands, Portugal, Spain and Sweden (EU member states), and associated countries Iceland and Norway (members of the European Economic Area-EEA).