The headwater of a river or stream is the geographical point of its beginning, specifically where surface runoff water begins to accumulate into a flowing channel of water. A river or stream into which one or many tributary rivers or streams flows has many headwaters, these being all of the individual headwaters of its tributaries. Each headwater is one of the river or stream's sources, as it is the place where surface runoffs from rainwater, meltwater, or spring water begin accumulating into a more substantial and consistent flow that becomes a first-order tributary of that river or stream. The tributary with the longest channel of all the tributaries to a river or stream, such length measured from that tributary's headwater to its mouth where it discharges into the river or stream, is the main stem of the river or stream in question.
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Headwaters in the context of Potomac River
The Potomac River (/pəˈtoʊmək/ ) is in the Mid-Atlantic region of the United States and flows from the Potomac Highlands in West Virginia to Chesapeake Bay in Maryland. It is 405 miles (652 km) long, with a drainage area of 14,700 square miles (38,000 km), and is the fourth-largest river along the East Coast of the United States. More than 6 million people live within its watershed.
The river forms part of the borders between Maryland and Washington, D.C., on the left descending bank, and West Virginia and Virginia on the right descending bank. Except for a small portion of its headwaters in West Virginia, the North Branch Potomac River is considered part of Maryland to the low-water mark on the opposite bank. The South Branch Potomac River lies completely within the state of West Virginia except for its headwaters, which lie in Virginia. All navigable parts of the river were designated as a National Recreation Trail in 2006, and the National Oceanic and Atmospheric Administration (NOAA) designated an 18-square-mile (47 km) portion of the river in Charles County, Maryland, as the Mallows Bay–Potomac River National Marine Sanctuary in 2019.
Headwaters in the context of Po (river)
The Po (/poʊ/ POH, Italian: [ˈpɔ]) is the longest river in Italy. It flows eastward across northern Italy, starting from the Cottian Alps. The river's length is 652 km (405 mi), or 682 km (424 mi) if the Maira, a right bank tributary, is included. The headwaters of the Po are formed by a spring seeping from a stony hillside at Pian del Re, a flat place at the head of the Val Po under the northwest face of Monviso. The Po then extends along the 45th parallel north before ending at a delta projecting into the Adriatic Sea near Venice.
Draining a basin of 74,000 km (29,000 sq mi), the Po is characterized by its large discharge (several rivers over 1,000 km have a discharge inferior or equal to the Po). It is, with the Rhône and Nile, one of the three Mediterranean rivers with the largest water discharge. As a result of its characteristics, the river is subject to heavy flooding. Consequently, over half its length is controlled with embankments.
Headwaters in the context of Wabash River
The Wabash River /ˈwɔːbæʃ/ WAW-bash (French: Ouabache [wabaʃ]) is a 503-mile-long (810 km) river that drains most of the state of Indiana, and a significant part of Illinois, in the United States. It flows from the headwaters in Ohio, near the Indiana border, then southwest across northern Indiana turning south near the Illinois border, where the southern portion forms the Indiana-Illinois border before flowing into the Ohio River.
It is the largest northern tributary of the Ohio River and third largest overall, behind the Cumberland and Tennessee rivers. From the dam near Huntington, Indiana, to its terminus at the Ohio River, the Wabash flows freely for 411 miles (661 km) The Tippecanoe River, White River, Embarras River and Little Wabash River are major tributaries. The river's name comes from a Miami word meaning "water over white stones", as its bottom is white limestone, now obscured by mud.
Headwaters in the context of Trinity River (Texas)
The Trinity River is a 710-mile (1,140 km) river. It rises in extreme northern Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the southern side of the Red River.
The Trinity River was previously identified as the stream that the Caddo called Arkikosa in Central Texas and Daycoa nearer the coast. However, in 2022, language preservationists from the Caddo Nation determined their ancestral language lacked the letter “R” sound. Arkikosa was likely a corruption or misspelling of the word Akokisa. In the vernacular of another tribe, the Atakapa who settled in the Gulf Coast woodlands, Akokisa means “river people.” French explorer Robert Cavelier de La Salle, in 1687, named the river, Riviere des canoës ("River of Canoes"). In 1690 Spanish explorer Alonso de León named it, "La Santísima Trinidad" ("the Most Holy Trinity").
Headwaters in the context of Angsi Glacier
The Angsi Glacier or Nangser Glacier (Tibetan: ངང་སེར་འཁྱགས་རོམ, Wylie: ngang ser 'khyags rom, THL: ngang ser khyak rom) is a glacier located on the northern side of the Himalayas in the Purang County in China's Tibet Autonomous Region. It is immediately to the east of the Indus-Tsangpo water divide at the eastern edge of the Purang County. One of the headwaters of the Tsangpo River (Brahmaputra), called Angsi Chu or Nangser Chu, originates in this glacier. Angsi Chu merges with the Chema-yungdung Chu within a short distance (30°24′14″N 82°16′37″E / 30.4038°N 82.277°E), and the combined river is called Chema-yungdung Chu.
Swami Pranavananda, an Indian ascetic and pilgrim, noted in 1939 that the Tibetan traditions regard the Chema-yungdung glacier as the source of Brahmaputra. He also noted that Kubi Chu, another source stream of Brahmaputra favoured by Sven Hedin, is larger, and that the Angsi Chu gives greater length.
Headwaters in the context of Sibun River
The Sibun River (Xibun River, formerly Sheboon River) is a river in Belize which drains a large central portion of the country. The Sibun (Xibun) were ancient Maya people who inhabited the region.
The headwaters of the Sibun River are located within the Maya Mountains, at approximately 800 meters above sea level, where the Sibun is known as the Caves Branch River. The river then flows through a gorge until it reaches an alluvial floodplain, where citrus and cacao plantations exist. Here the river valley is flanked by karst topography featuring Maya cave sites. Before the river reaches the village of Freetown Sibun, river figs and spiny bamboo (Guadua longifolia) are common along its banks; along the stretch of river between the coast and the village, mangroves are predominant. It empties into the Caribbean Sea, south of Belize City.