Uttarakhand, a state in northern India crossed by the Himalayas, is known for its Hindu pilgrimage sites. Rishikesh, a major centre for yoga study, was made famous by the Beatles’ 1968 visit. The city hosts the evening Ganga Aarti, a spiritual gathering on the sacred Ganges River. The state's forested Jim Corbett National Park shelters Bengal tigers and other native wildlife. Uttarakhand has a total area of 53,483 km2, of which 86% is mountainous and 65% is covered by forest. Most of the northern part of the state is covered by high Himalayan peaks and glaciers. In the first half of the nineteenth century, the expanding development of Indian roads, railways and other physical infrastructure was giving rise to concerns over indiscriminate logging, particularly in the Himalaya. Two of the most important rivers in Hinduism originate in the region, the Ganges at Gangotri and the Yamuna at Yamunotri. These two along with Badrinath and Kedarnath form the Chota Char Dham, a holy pilgrimage for the Hindus.