2,436 articles
Mozambique Channel
Mozambique Channel: Indian Ocean arm between Mozambique and Madagascar, about 400 km wide at its narrowest. Known for southward-propagating anticyclonic eddies feeding the Agulhas Current, rich coral biodiversity, tanker shipping, gas reserves, and Franco-Malagasy island disputes.
Muddus National Park
Muddus National Park (Sámi: Muttos), Norrbotten, Sweden: 49,340-ha national park founded 1942, Sweden's largest forest national park, with 700-year-old pines, the 42 m Muddus Waterfall, and Laponia World Heritage membership since 1996.
Mudskipper
Mudskippers are amphibious gobies (Oxudercidae, Oxudercinae), about 34-45 species of Indo-West Pacific and West African mudflat fish that breathe air through skin, walk on pectoral fins, and brood eggs in air-filled burrows.
Muir-Byenup System
Muir-Byenup System, Ramsar site 1050 in south-west Western Australia near Manjimup: a 10,631-hectare complex of lakes and peat swamps, listed 2001, important for waterbirds, endemic fish and threatened orchids.
Multnomah Falls
Multnomah Falls is a 620-foot two-tiered waterfall on Multnomah Creek in the Columbia River Gorge, Oregon, about 30 miles east of Portland and the state's tallest.
Mun
Mun River (แม่น้ำมูล), largest Mekong tributary by area in northeast Thailand's Khorat Plateau; home of the controversial 136 MW Pak Mun Dam (1994) and moated Iron Age archaeological sites.
Mur
Mur (Mura), Central European river and Danube sub-tributary via the Drava; rises in Austria's Lungau at 1,898 m, flows past Graz, forms borders with Slovenia, Croatia, Hungary, joins the Drava at Légrád.
Muraenidae
Muraenidae, the moray eels, is a family of Anguilliformes eels with about 200-227 species in 15-16 genera, two subfamilies (Muraeninae, Uropterygiinae), tropical reef predators with raptorial pharyngeal jaws.
Murchison Sound
Murchison Sound, a sound in northwestern Greenland forming the northern entrance to Inglefield Gulf in Baffin Bay, named after geologist Sir Roderick Murchison; shallow (<200 m) narwhal and walrus habitat near McCormick Bay and Cape Robertson.
Murray (lake)
Lake Murray is the name of several lakes, chiefly the largest lake in Papua New Guinea and a large hydroelectric reservoir on the Saluda River in South Carolina.
Murray (мурреи, rivers_lake_centerlines:54)
The River Murray (Murrundi) is Australia's longest river at 2,508 km, running from the Great Dividing Range to the Southern Ocean at Goolwa; central to the Murray–Darling Basin, Ngarrindjeri culture, irrigation, and salinity management.
Murray Ridge
Murray Ridge is a chain of bathymetric highs in the northern Arabian Sea forming part of the India–Arabia plate boundary with Dalrymple Trough; it is underlain by continental crust. Distinct from a British Columbia ultramafite ridge and a Sinemurian formation in the Northwest Territories.
Murray River
Murray River (River Murray), main river of the Murray–Darling system, Australia's longest river system. Known for low, variable flows, heavy salinity managed since 1988, and the Murray Mouth salt export.
Murray–Darling basin
Murray–Darling Basin, Australia's largest river system in the south-east, spanning five jurisdictions; governed by the 2012 Basin Plan, with water recovery targets of 2,075 plus 450 GL/y and storages at 61 percent in mid-2025.
Muskeg
Muskeg, or Maskīk, is a North American term for peatland, waterlogged terrain of sphagnum moss and stunted black spruce that covers every Canadian province and stores vast carbon.
MV Wakashio oil spill
MV Wakashio oil spill: 2020 grounding of a Japanese-owned, Panamanian-flagged capesize bulker off Pointe d'Esny, Mauritius; about 1,000 tonnes of Very Low Sulfur Fuel Oil spilled, the first major VLSFO spill, after a deliberate course deviation toward shore.
Mweru
Lake Mweru, a Zambia-DRC border lake in the Congo basin fed by the Luapula River; major inland fishery, endemic cichlid radiation, and the new Luapula River and Lake Mweru Authority. Distinct from Lake Mweru Wantipa.
Mývatn
Mývatn ("midge lake") is a 37 km² shallow, spring-fed, naturally eutrophic lake in northeastern Iceland, formed about 2,300 years ago, famous for chironomid midges, duck diversity, Ramsar protection, and pseudocraters.
Nagaoka Ridge
Nagaoka Ridge: elongated undersea ridge in the North Pacific Ocean (about 24.04 N, 144.27 E), 80 x 20 km, relief 3,536 m; discovered 1987 by survey vessel Takuyo, named for geologist Shinji Nagaoka.
Nal Sarovar Bird Sanctuary
Nal Sarovar Bird Sanctuary (Nalsarovar, નાળ સરોવર) is a 12,000-hectare shallow freshwater lake and Ramsar site (no. 2078, designated 2012) in Gujarat, India, the largest natural wetland of the Thar Desert province and a Central Asia Flyway stopover hosting over 200 bird species.
Namak
Namak (FEOW ecoregion 447) is a Palearctic freshwater ecoregion covering the endorheic basin of Namak Lake, a 1,800 km2 salt lake in north-central Iran, with endemic fishes and declining low flows.
Namtso
Namtso (纳木错, gnam mtsho, Tengri Nor), the "heavenly lake," is a ~2,000 km² saline closed-basin lake at ~4,718 m on the Tibetan Plateau, China's second-largest saltwater lake and a Tibetan Buddhist holy lake.
Nansen Basin
Nansen Basin: southern abyssal sub-basin of the Eurasia Basin, Arctic Ocean, between the Gakkel Ridge and the Barents-Kara margin; ultra-slow spreading origin, sediments up to 4.5 km, Atlantic Water inflow.
Nantucket Inlet
Nantucket Inlet, Antarctica (Nantucket, ensenada): ice-filled Weddell Sea inlet on Palmer Land's east coast, 6 by 13 miles, between Bowman and Smith Peninsulas, fed by Johnston Glacier.
Naococane
Lac Naococane (Lake Naococane), a 398 km² lake in Eeyou Istchee Baie-James, Nord-du-Québec, Quebec; East Cree name origin, drains toward La Grande Rivière; officialized 5 December 1968.
Napaktulik
Napaktulik Lake, Nunavut, Canada (Inuinnaqtun, "the place where there are trees"), formerly Takijuq Lake; 1,080 km2, 381 m elevation, eighth-largest lake in Nunavut, mapped by Samuel Hearne in 1771.
Napo
Napo (Río Napo), Andes-to-Amazon tributary rising near Quito, Ecuador, flowing ~885–1,125 km through Ecuador and Loreto, Peru, into the Amazon; ~6,300 m³/s discharge, Curaray its main tributary, Yasuní and Cuyabeno protected areas.
Nares Strait
Nares Strait, between Ellesmere Island, Canada, and Greenland, is the northernmost outflow gateway of the Arctic Ocean, linking the Lincoln Sea to Baffin Bay with about 0.8 Sv southward flow, winter ice arches, and the North Water polynya.
Narmada River (नर्मदा नदी)
Narmada River (नर्मदा नदी), also Narbada, India's longest west-flowing river, 1,312 km from Amarkantak to the Gulf of Khambhat; site of the Sardar Sarovar Dam, its irrigation network, and the Narmada Bachao Andolan displacement controversy.
Narmada-Tapti
Narmada-Tapti (FEOW ecoregion 708), a freshwater ecoregion covering the Mahi, Narmada, and Tapi river basins of India draining to the Gulf of Khambhat; intense monsoon flood regime, no endemic fishes, largest river basin of Madhya Pradesh.