151 articles
Uchur
Uchur (Учур), Evenki for "whirlwind", is an 812 km right tributary of the Aldan River in Khabarovsk Krai and Yakutia, Russia, draining 113,000 km² with a mean discharge of 1345 m³/s, navigable on its lower 159 km.
Upper Amu Darya
Upper Amu Darya: mountainous headwater reach of the Amu Darya (Oxus) in the Pamir and Hindu Kush, bordering Afghanistan and Tajikistan; generates over 90% of the river's flow, about 72.6 km³ annually.
Upper Brahmaputra
Upper Brahmaputra (Yarlung Zangbo, Tsang Po) is the Tibetan Plateau portion of the Brahmaputra basin, about 240,000 km2, defined by glacier- and snowmelt-driven hydrology, late-1990s water yield regime shifts, and FEOW ecoregion 711.
Upper Huang He
The Upper Huang He (upper Yellow River) is the headwater reach of China's Yellow River on the Tibetan Plateau, freshwater ecoregion 634 supplying over 35% of the basin's water.
Upper Irtysh
Upper Irtysh (Black Irtysh, Ertix He): headwater reach of the Irtysh River from the Altai glaciers in Xinjiang through Lake Zaysan to Ust-Kamenogorsk; also FEOW freshwater ecoregion 603 with 43 fish species, two endemics, and a large Soviet dam cascade.
Upper Salween
Upper Salween: FEOW freshwater ecoregion 721, Palearctic, tropical and subtropical upland rivers, covering the Salween (Nu) basin in China north of the Nanding River confluence, with 8 endemic fish species.
Usa (river, Russia)
Usa (Уса), river in the Komi Republic, Russia; largest tributary of the Pechora, 565 km long, basin 93,600 km², mean discharge 1,310 m³/s, frozen November to May, navigable 325 km from Ust-Usa.
Vakh
Vakh (Вах) is a 964 km river in Khanty-Mansia, western Siberia, a right tributary of the Ob with a 76,700 km² basin, mean discharge 665 m³/s, navigable 453 km, and the Samotlor oil field in its basin.
Vasyugan
The Vasyugan (Васюган) is a 1,082 km river in Tomsk Oblast, Russia, and a left tributary of the Ob, rising in the Vasyugan bogs of the West Siberian Plain.
Verkhniy Yenisey
Verkhniy Yenisey (Ulug-Khem, Upper Yenisey) is the upper course of the Yenisei River in Tuva, Russia, from the Maly and Bolshoy Yenisey confluence at Kyzyl; 188 km to the Khemchik mouth, 1,238 km to the Tuba under the wider definition.
Vilyuy
Vilyuy (Вилюй) is a 2,650 km Siberian river, the largest left tributary of the Lena in Yakutia, with a 454,000 km² permafrost basin, a dam at Chernyshevsky, and diamond-mining region around Mirny; distinct from a small Neyva tributary of the same name.
Vĩnh Tế Canal
The Vĩnh Tế Canal (Kênh Vĩnh Tế) is an 87 km canal in Vietnam's Mekong Delta, dug under the Nguyễn dynasty between 1819 and 1824.
Vitim
Vitim (Витим) is a 1,837 km right tributary of the Lena in eastern Siberia, draining 225,000 km², with rain-fed flow, Bodaybo gold mining, and Pleistocene glacial Lake Vitim megafloods.
Wainganga
Wainganga River, also Vriddha-Ganga, a major Godavari tributary rising in Seoni district, Madhya Pradesh, flowing about 580-642 km through Maharashtra to join the Wardha and form the Pranahita.
Wei
Wei (渭河, Wei Shui), largest tributary of the Yellow River, 818 km, rising in Weiyuan County, Gansu, crossing the Guanzhong Plain past Xi'an to join the Yellow River at Tongguan; heavily irrigated since 246 BC, water-scarce, with declining runoff and falling sediment load.
Western Anatolia
Western Anatolia is a freshwater ecoregion (FEOW 429) spanning the Aegean coast of Anatolian Turkey between the Sea of Marmara and the Mediterranean, known for endemic fishes.
Wu
Wu (乌江, Wujiang, Wu River), largest right-bank tributary of the upper Yangtze: 1,037 km, 2,124 m drop, karst basin of 87,920 km2, an 11-dam hydropower cascade totaling 8,665 MW in Guizhou.
Wujia
Wujia River (乌加河), also Wujiahe, is an abandoned former channel of the Yellow River in Inner Mongolia's Hetao Plain that silted around 1850 and now serves as the main drainage channel of the Hetao Irrigation District, feeding Wuliangsuhai Lake.
Xiang
The Xiang River, also called Xiangjiang (湘江), is a major Yangtze tributary flowing about 844 km north through Hunan into Dongting Lake, and is Hunan's namesake abbreviation.
Xiao and Xiang Rivers
The Xiao and Xiang Rivers (潇湘), in Hunan Province, China, both flow into Dongting Lake; their name, Xiaoxiang, became a classic subject of Chinese landscape painting.
Yalu River
The Yalu River (Amnokkang; Yalu Jiang) is a 790 km river forming the western China–North Korea border from Mount Paektu to the sea at Dandong and Sinuiju, fixed by the 1962 border treaty and crossed by the New Yalu River Bridge, opened 2026.
Yamuna (यमुना)
Yamuna (यमुना), largest tributary of the Ganges, rises at Yamunotri Glacier, flows 1,376 km past Delhi to Prayagraj; sacred to Hindus and among the world's most polluted rivers.
Yangtze
Yangtze (长江, Changjiang), Asia's longest and the world's third-longest river, 6,300 km from the Tibetan Plateau to the East China Sea; home of the Three Gorges Dam, a 2021 ten-year fishing ban, and recovering fish biodiversity.
Yellow (landform)
Yellow (landform): the Yellow River (Huang He) system of northern China, a 5,400 km silt-laden river from the Tibetan Plateau to the Bohai Sea, cradle of Chinese civilization and China's most flood-prone landform.
Yellow River (黄河)
Yellow River (黄河, Huang He), China's second largest river and the world's most sediment-laden major river, draining the Loess Plateau to the Bohai Sea; peak sediment load 2.1 Gt/yr in 1958, 1,593 levee breaches historically, sediment now down ~90% since the 1980s.
Yenisei
Yenisei (Енисей), Siberia's largest Arctic river, formed near Kyzyl by the Bolshoi and Malyi Yenisei; 4092 km long, 2,580,000 km² basin, 17,400 m³/s flow into the Kara Sea, heavily dammed.
Yenisey
Yenisey (Yenisei), Siberia's great north-flowing river, largest Arctic river by discharge (673 km3/yr), basin 2.58 million km2, heavily dammed, contaminated by plutonium plant at Zheleznogorsk.
Yom
The Yom River (Thai: แม่น้ำยม, Maenam Yom) is a 735 km river in northern Thailand and a principal tributary of the Nan River, part of the Chao Phraya system.
Zeravshan
Zeravshan (Зарафшон), also Zarafshan or Zerafshan, a Central Asian river rising in Tajikistan's Alai Range, watering Samarkand and Bukhara oases; formerly an Amu Darya tributary, it now ends near Gijduvon, its water fully used for irrigation.
Zeya
Zeya (Зея): river in Amur Oblast, largest left tributary of the Amur (1,242 km, 232,000 km² basin), and its Zeya Dam, a 1,330 MW buttress-dam hydro plant launched 1975 with the world's first 220 MW diagonal turbines.