Nepal is of roughly trapezoidal shape, 800 kilometres (500 mi) long and 200 kilometres (125 mi) wide, with an area of 147,181 square kilometres (56,827 sq mi). Nepal is commonly divided into three physiographic areas: the Mountain, Hill, and Terai Regions. These ecological belts run east-west and are bisected by Nepal's major river systems. Nepal is roughly the same size as the US state of Arkansas.
The Madhesi Plains bordering India are part of the northern rim of the Indo-Gangetic plains. They were formed and are fed by three major rivers: the Kosi, the Narayani (India's Gandak River), and the Karnali. This region has a hot, humid climate.
The Hill Region (Pahad) abuts the mountains and varies from 1,000 to 4,000 metres (3,300–13,125 ft) in altitude. Two low mountain ranges, the Mahabharat Lekh and Shiwalik Range (also called the Churia Range) dominate the region. The hilly belt includes the Kathmandu Valley, the country's most fertile and urbanised area. Unlike the valleysCalled Inner Tarai (Bhitri Tarai Uptyaka) elevations above 2,500 metres (8,200 ft) are sparsely populated.
The Mountain Region contains the highest region in the world. The world's highest mountain, Mount Everest (Sagarmatha in Nepali) at 8,850 metres (29,035 ft) is located on the border with China. Seven more of the world's fourteen highest mountains are located in Nepal: Lhotse, Makalu, Cho Oyu, Kanchenjunga, Dhaulagiri, Annapurna and Manaslu. Deforestation is a major problem in all regions, with resulting erosion and degradation of ecosystems.
Nepal has five climatic zones, broadly corresponding to altitude. The tropical and subtropical zones lie below 1,200 metres (3,940 ft), the temperate zone 1,200 to 2,400 metres (3,900–7,875 ft), the cold zone 2,400 to 3,600 metres (7,875–11,800 ft), the subarctic zone 3,600 to 4,400 metres (11,800–14,400 ft), and the Arctic zone above 4,400 metres (14,400 ft). Nepal experiences five seasons: summer, monsoon, autumn, winter and spring. The Himalaya blocks cold winds from Central Asia in winter, and forms the northern limit of the monsoon wind patterns.
Although Nepal shares no boundary with Bangladesh, the two countries are separated by a narrow strip of land about 21 kilometre (13 mi) wide, called the Chicken's Neck. Efforts are underway to make this area a free-trade zone.
Situated in the Great Himalayan Range in Northern part of Nepal, Mount Everest is the tallest mountain in the world. Technically, the south-east ridge on the Nepali side of the mountain is easier to climb, so most climbers travel to Everest through Nepal. The Annapurna mountain range also lies in Nepal.
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