Afghanistan occupies 652,230 square kilometers in Central and South Asia. The country shares borders with six nations: Iran to the west (921 kilometers), Pakistan to the south and east (2,670 kilometers), Turkmenistan to the northwest (804 kilometers), Uzbekistan to the north (144 kilometers), Tajikistan to the northeast (1,357 kilometers), and China to the far northeast through the Wakhan Corridor (91 kilometers). Afghanistan is landlocked, with its nearest coastline approximately 480 kilometers away at the Arabian Sea. The country sits at the crossroads of Central Asia, South Asia, and the Middle East, a position that has shaped its history as a corridor for trade, migration, and military campaigns.
The Hindu Kush mountain range dominates central Afghanistan, running northeast to southwest for approximately 1,100 kilometers. Peaks in the Hindu Kush frequently exceed 6,000 meters, with Noshaq standing at 7,492 meters as the country's highest point on the border with Pakistan. The range divides Afghanistan's northern plains from the southern river basins and deserts. The Pamir Mountains extend into the northeastern Wakhan Corridor, where Afghanistan's geography narrows to a finger of land sometimes less than 15 kilometers wide at an elevation above 4,000 meters. The Wakhan Corridor stretches approximately 350 kilometers, created as a buffer zone between the Russian Empire and British India during the late nineteenth century. This high-altitude region connects Afghanistan to China's Xinjiang province and remains one of the most isolated territories in the country.
The Salang Pass crosses the Hindu Kush at 3,878 meters, connecting Kabul to northern provinces. The Salang Tunnel, constructed with Soviet assistance between 1955 and 1964, runs 2.67 kilometers at an elevation of 3,363 meters, making it one of the highest tunnels in the world at the time of completion. The Khyber Pass, though more famous historically, sits at 1,070 meters on the Afghanistan-Pakistan border south of Kabul. This pass has served as the primary land route between Central Asia and the Indian subcontinent for millennia, with a width varying from three to 137 meters through its narrowest sections.
Northern Afghanistan consists of plains and foothills descending from the Hindu Kush toward the Amu Darya River, which forms much of the northern border with Turkmenistan, Uzbekistan, and Tajikistan. The Amu Darya flows approximately 2,400 kilometers from the Pamir Mountains to the Aral Sea, though its Afghan section spans roughly 1,200 kilometers. The river remains one of Central Asia's major waterways, with discharge rates varying from 1,000 cubic meters per second during low flow to over 5,000 cubic meters per second during spring snowmelt. The northern plains support agriculture where irrigation reaches, particularly around Mazar-i-Sharif, Kunduz, and Balkh. Elevation in the northern provinces ranges from 300 meters near the Amu Darya to 2,000 meters at the Hindu Kush foothills.
The Kabul River originates in the Hindu Kush west of Kabul at approximately 2,700 meters elevation. The river flows 700 kilometers east through Kabul, Jalalabad, and across the Pakistan border before joining the Indus River. Average annual discharge at Kabul measures approximately 250 cubic meters per second, though flow varies substantially between wet and dry seasons. The Panjshir Valley extends northeast from the Kabul River valley for roughly 100 kilometers, carved by the Panjshir River between mountain walls rising 3,000 to 5,000 meters on either side. The valley narrows to less than one kilometer in some sections, creating defensive terrain that proved resistant to both Soviet and Taliban control during various conflicts.
Western Afghanistan transitions from the Hindu Kush to the Iranian plateau, with elevations between 600 and 1,200 meters dominating the landscape around Herat. The Hari River flows 1,100 kilometers from the central highlands westward through Herat before turning north into Turkmenistan. The river provides irrigation for the Herat Valley, supporting agriculture in an otherwise arid region that receives 200 to 250 millimeters of annual precipitation. Badghis and Ghor provinces in the west contain highland terrain exceeding 2,000 meters, with the Band-e Amir lakes in Bamyan province to the east forming Afghanistan's first national park in 2009.
The Helmand River constitutes Afghanistan's longest river at 1,150 kilometers, originating in the Hindu Kush west of Kabul at approximately 3,500 meters. The river flows southwest through Helmand province before entering the Sistan Basin, a depression shared with Iran where elevation drops below 500 meters. The Helmand drains approximately 40 percent of Afghanistan's total area. The Helmand Valley and Arghandab River valley to the east historically supported extensive irrigation systems, some dating to pre-Islamic periods. The Kajaki Dam, constructed on the Helmand River between 1950 and 1953 with funding from the United States, created a reservoir with a capacity of 1.7 billion cubic meters and generates hydroelectric power through turbines installed in phases through 1975.
Southern Afghanistan encompasses the Registan Desert, covering approximately 40,000 square kilometers of Kandahar and Helmand provinces. The name Registan derives from Persian words meaning "land of sand." The desert consists of sand dunes reaching 15 to 20 meters in height interspersed with gravel plains. Annual precipitation in the Registan rarely exceeds 100 millimeters, falling primarily between December and March. The Dasht-e Margo, or Desert of Death, extends west of the Registan in Nimruz and Helmand provinces. This region receives less than 50 millimeters of annual precipitation and experiences summer temperatures exceeding 50 degrees Celsius. The Dasht-e Leili, a desert area in Jowzjan province near Sheberghan, gained attention for different reasons unrelated to geography.
Kabul sits at 1,790 meters elevation in a valley surrounded by the Hindu Kush, with the city occupying both the valley floor and extending onto surrounding hillsides. The metropolitan area spans approximately 1,028 square kilometers. Kandahar, Afghanistan's second-largest city, sits at 1,010 meters elevation on the edge of the Registan Desert. Herat occupies the Hari River valley at 920 meters elevation in western Afghanistan, approximately 120 kilometers from the Iranian border. Mazar-i-Sharif lies at 378 meters elevation in the northern plains, making it one of Afghanistan's lowest major cities. Jalalabad sits at 580 meters in the Kabul River valley, creating a substantially warmer climate than Kabul despite a straight-line distance of only 95 kilometers.
Afghanistan experiences a continental climate characterized by hot summers and cold winters, with significant variation based on elevation. Temperature differences between summer and winter frequently exceed 40 degrees Celsius in many locations. Kabul records average January temperatures between -7 and 1 degree Celsius and July temperatures between 15 and 32 degrees Celsius. Kandahar experiences milder winters, with January averages between 2 and 12 degrees Celsius, but similar summer heat with July temperatures between 25 and 40 degrees Celsius. Jalalabad's lower elevation produces January temperatures between 4 and 18 degrees Celsius and July temperatures between 30 to 42 degrees Celsius. The northern city of Mazar-i-Sharif records January temperatures between -3 and 7 degrees Celsius and July temperatures between 26 and 39 degrees Celsius.
Precipitation in Afghanistan follows a pattern dominated by westerly weather systems during winter and spring. Most of the country receives 80 to 90 percent of annual precipitation between October and May. The Hindu Kush intercepts moisture-bearing systems, creating an orographic effect where windward slopes receive substantially more precipitation than leeward areas. Nuristan province in the eastern Hindu Kush receives 500 to 1,000 millimeters annually, the highest precipitation in Afghanistan. The Salang Pass area records 700 to 800 millimeters annually, primarily as snow between November and April. Snow accumulation in the Hindu Kush regularly exceeds 3 meters at elevations above 3,000 meters, feeding rivers that provide summer water to lower elevations.