Rivers, streams, and drainage features

Desna

Desna (Десна), longest left tributary of the Dnipro, rising in Russia's Smolensk Highland and joining the Dnipro 6 km above Kyiv; 1,130 km long, 88,900 km² basin, mean discharge 360 m³/s, main tributaries Seim, Sudost, Snov, Oster.

Detroit River

The Detroit River is a 51-kilometer strait in the Great Lakes that carries water from Lake St. Clair down to Lake Erie and forms the US–Canada boundary.

Ditch mouth

Ditch mouth: the downstream end of a drainage ditch where it discharges into a river, lake, or other receiving water; also called the outlet. Prone to erosion and sediment deposition, stabilized with grassed chutes, rock chutes, or engineered sedimentation basins.

Divide

Divide (drainage divide, water parting): elevated boundary separating drainage basins, from minor ridges to continental divides like the Rockies' Great Divide; divides migrate at 0.001–10 mm/yr and can shift with erosion, uplift, or pumping.

Dja

Dja (Ngoko River), Central African river rising near Abong-Mbang, Cameroon, joining the Sangha; nearly encircles the Dja Faunal Reserve, a 5,260 km2 UNESCO World Heritage Site established in 1950.

Dnieper (Дніпро)

Dnieper (Дніпро, Dnipro), third-largest river in Europe after the Volga and Danube, rises in Russia's Valdai Hills and flows 2,285 km through Belarus and Ukraine to the Black Sea; dammed into six Soviet reservoirs, its Kakhovka dam was destroyed in 2023.

Dniester

Dniester (Дністер), Tyras of antiquity, a 1,362 km river rising in the Ukrainian Carpathians, flowing through Moldova to the Black Sea; Moldova's main drinking-water source, dammed by the Dniester HPP, governed by the 2012 Dniester Treaty.

Dniester - Lower Danube

Dniester - Lower Danube is a freshwater ecoregion (FEOW 418) in southeastern Europe, covering the basins of the Dniester and Danube rivers, which both drain into the Black Sea.

Doce

Doce (Rio Doce), 853-km river in Minas Gerais and Espírito Santo, Brazil, flowing to the Atlantic at Regência; site of the 2015 Fundão dam collapse and the 2024 R$ 170 billion reparation agreement.

Don (landform)

Don (landform): name of several rivers, chiefly the 1,870 km Russian Don flowing to the Sea of Azov, plus the Yorkshire, Toronto, Queensland, and Victorian Don rivers.

Don (protected area)

Don is a freshwater ecoregion, unit 427 in the Freshwater Ecoregions of the World classification, covering the whole Don River basin and smaller rivers draining into the Sea of Azov.

Donets

Donets (Siverskyi Donets, Seversky Donets): 1,053 km river rising in the Central Russian Upland, largest tributary of the Don, flowing through Kharkiv, Donetsk, and Luhansk oblasts; main water source of eastern Ukraine and namesake of the Donbas.

Douro

Douro (Spanish Duero): Iberian river rising in Spain, forming a 112 km border with Portugal, flowing to the Atlantic at Porto. Third-longest Iberian river, largest basin; 710 m3/s mean flow, heavily dammed, Port wine valley.

Drainage basin

A drainage basin, also called a watershed or catchment, is an area of land draining all streams and rainfall to a common outlet, bounded by a drainage divide.

Drainage system (geomorphology)

In geomorphology, a drainage system, also called a drainage pattern, is the network of stream channels and tributaries collecting surface runoff, shaped by slope, bedrock, and fracture pattern.

Duck River (Tennessee)

The Duck River (Tennessee) is a 284-mile river, the longest entirely within Tennessee, flowing from the Highland Rim to the Tennessee River; one of North America's most biodiverse rivers and drinking water source for over 250,000 people.

Dulce

Río Dulce (sweet river), Guatemalan river, about 42 km, draining Lake Izabal to the Caribbean at Livingston, Izabal; protected since 1955 as 13,000-ha Río Dulce National Park with Castillo de San Felipe de Lara and manatee habitat.

East Texas Gulf

East Texas Gulf (FEOW ecoregion 140) is a temperate coastal rivers freshwater ecoregion covering central Texas from eastern New Mexico, defined by the Brazos and Colorado watersheds and Matagorda Bay, with about 100 fish species and few endemics.

Eastern Borneo

Eastern Borneo is a freshwater ecoregion of eastern Borneo, entirely within Indonesia's East Kalimantan province, defined by a distinct fish assemblage centered on the Mahakam River basin.

Eastern Continental Divide

The Eastern Continental Divide is the drainage divide of the eastern United States separating Atlantic Ocean watersheds (Susquehanna, Potomac, Roanoke) from Mississippi River, Gulf of Mexico drainage, running partly through the Appalachian Mountains.

Eastern Hudson Bay - Ungava

Eastern Hudson Bay - Ungava, FEOW freshwater ecoregion 113, a Temperate coastal rivers unit in northern Quebec and Labrador draining to Hudson Bay, Ungava Bay, and the Labrador Sea; no endemic fishes, Arctic char runs, Threatened and Endangered beluga stocks.

Eastern Iberia

Eastern Iberia (FEOW ecoregion 414, Ibero-Mediterranean ecoregion) is a freshwater ecoregion of northeastern Spain, Andorra, and France, covering Mediterranean-draining basins including the Ebro, Ter, and Júcar, with high Iberian fish endemism.

Eastern Taiwan

Eastern Taiwan (FEOW ecoregion 758) is a freshwater ecoregion covering basins east of Taiwan's Chungyang Range draining to the Philippine Sea, from Eluanbi to Wushibi, including Green Island and Orchid Island, with main rivers Lanyang and Peinan and few endemic fishes.

Eastern Yellow Sea Drainages

The Eastern Yellow Sea Drainages is a freshwater ecoregion (ID 638) spanning China and Korea, covering the Yalu River basin and streams draining into Korea Bay and the Yellow Sea.

Ebro

The Ebro (Spanish río Ebro, Latin Iberus) is one of the five great rivers of the Iberian Peninsula, rising in the Cantabrian Mountains and the only one flowing to the Mediterranean.

Eel River (California)

Eel River (California): third-largest California watershed (~3,684 sq mi), wild and scenic since 1972/1981; its Scott and Cape Horn dams form the Potter Valley Project, slated for removal.

Elbe

The Elbe (Czech: Labe) is a 1,094-km Central European river rising in the Giant Mountains and draining to the North Sea; its 148,268 km² basin serves Hamburg's port, with documented pollution recovery after 1990 and severe 2025–2026 low water.

English

English (English River), a 615 km dam-unregulated river in northwestern Ontario's Kenora and Thunder Bay districts; protected by the Upper English River Conservation Reserve and East English River Provincial Park, with a mercury legacy downstream of Dryden.

Esfahan (protected area)

Esfahan (FEOW ecoregion 449) is a freshwater ecoregion covering the endorheic Zayandeh River basin of central Iran, draining to the Gavkhuni salt marsh, with poor taxonomic exploration and a Critically Endangered endemic tooth-carp.