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.
In geography, Denmark is the land in northern Europe, where the Danes live. In the political sense, the Kingdom of Denmark also includes the Faroe Islands in the Atlantic Ocean, and Greenland in North America. All three parts of the country have different languages and culture.