used. Australians also bushwalk. In English-speaking parts of North America, the term walking is used for short walks, especially in towns and cities. Snow shoeing is walking in snow; a slightly different gait is required compared with regular walking. Tourism In terms of tourism, the possibilities range from guided walking tours in cities, to organized trekking holidays in the Himalayas. In the UK the term walking tour also refers to a multi-day walk or hike undertaken by a group or individual. Well-organized systems of trails exist in many other European counties, as well as Canada, United States, New Zealand, and Nepal. Systems of lengthy waymarked walking trails now stretch across Europe from Norway to Turkey, Portugal to Cyprus. Many also walk the traditional pilgrim routes, of which the most famous is El Camino de Santiago, The Way of St. James. Numerous walking festivals and other walking events take place each year in many countries. The world's largest multi-day walking event is the International Four Days Marches Nijmegen in the Netherlands. The "Vierdaagse" (Dutch for "Four day Event") is an annual walk that has taken place since 1909; it has been based at Nijmegen since 1916. Depending on age group and category, walkers have to walk 30, 40 or 50 kilometers each day for four days. Originally a military event with a few civilians, it now is a mainly civilian event. Numbers have risen in recent years, with over 40,000 now taking part, including about 5,000 military personnel. Due to crowds on the route, since 2004 the organizers have limited the number of participants. In the U.S., there is the annual Labor Day walk on Mackinac Bridge, Michigan, which draws over 60,000 participants; it is the largest single-day walking event; while the Chesapeake Bay Bridge Walk in Maryland draws over 50,000 participants each year. There are also various walks organised as charity events, with walkers sponsored for a specific cause. These walks range in length from two miles (3 km) or five km to 50 miles (80 km). The MS Challenge Walk is an 80 km or 50-mile walk which raises money to fight multiple sclerosis, while walkers in the Oxfam Trailwalker cover 100 km or 60 miles. Rambling In Britain, The Ramblers, a registered charity, is the largest organisation that looks after the interests of walkers, with some 100,000 members. Its "Get Walking Keep Walking" project provides free route guides,