1838 Pest flood
The 1838 Pest flood was a Danube ice flood that devastated Pest, Buda, and Óbuda in March 1838, killing 153 people and destroying over half of Pest's houses.
1879 Szeged flood
The 1879 Szeged flood was a catastrophic inundation when the Tisza River broke through the levees in March 1879, destroying most of Szeged and prompting a planned rebuilding under Lajos Lechner.
1931 China floods
1931 China floods (1931年长江水灾, 江淮水灾): summer 1931 Yangtze and Huai valley inundations, the deadliest recorded natural disaster, flooding ~170,000–180,000 km², affecting 25 million, killing over 2 million including famine and disease deaths.
2002 European floods
The 2002 European floods were catastrophic river floods in August 2002 along the Danube, Elbe, and Vltava, killing dozens and causing about €18.5 billion in damage.
2007–08 Zambezi floods
The 2007–08 Zambezi floods were two rainy-season floods in central Mozambique that killed at least 35 people, affected about 485,000, and caused $171 million in damage.
2010 Central European floods
The 2010 Central European floods were river floods in Poland and neighboring countries in May, June, and August 2010, producing the Vistula's highest crest in 160 years.
2011 Thailand floods
The 2011 Thailand floods, the country's worst in over half a century, inundated 66 provinces from July to December 2011 and caused about USD 46.5 billion in losses.
2012 Nigeria floods
The 2012 Nigeria floods were a nationwide disaster from July to October 2012 that killed 363 people, displaced millions, and caused about $16 billion in damage.
A Directory of Important Wetlands in Australia
A Directory of Important Wetlands in Australia (DIWA) is the Australian national inventory of nationally important wetlands, first published 1993 with editions in 1996 and 2001; inclusion requires meeting at least one of six ANZECC 1994 criteria, and the online Directory now holds over 900 sites.
Abaya (landform)
Lake Abaya (Abaya landform), also called Lake Margherita, is Ethiopia's largest Rift Valley lake (1,160 km2), a turbid, reddish-brown, quasi-endorheic freshwater lake draining into Lake Chamo via the Kulfo River.
Abyssal plain
Abyssal plains are flat, sediment-covered deep-ocean floor at 3,000–6,000 m depth, covering roughly 30–70% of the seafloor depending on definition; they host polymetallic nodules targeted by deep-sea mining, notably in the Clarion-Clipperton Zone.
Abzu
Abzu (Akkadian apsû) is the Mesopotamian underground freshwater ocean, domain of Enki/Ea, source of all springs, and in Enūma Eliš the primal sweet-water deity killed by Ea, distinct from Tiamat's salt sea.
Acheron (Αχέροντας)
Acheron (Αχέροντας), the mythological river of pain, is a 64 km river in Epirus, Greece, flowing from the Souli Mountains to the Ionian Sea at Ammoudia; a Natura 2000 site tied to Homer's underworld and the necromanteion.
Acqui Terme
Acqui Terme, Piedmont town on Roman Aquae Statiellae, famed for the 75°C Bollente sulphur-bromine-iodine spring, Roman baths, Nuove Terme and Regina spas, closed amid 2026 concession dispute.
Active Sound
Active Sound (Estrecho Active) is a 17.5 km sound between Joinville and Dundee Islands, Antarctic Peninsula, charted 1892-93 by the Dundee Whaling Expedition and named for the barque Active.
Adie Inlet
Adie Inlet: ice-filled inlet of the Larsen Ice Shelf between Veier Head and Astro Cliffs, Oscar II Coast, Graham Land, at 66°25'S 62°20'W; about 40 km long; named 1947–51 for FIDS geologist Raymond Adie.
Admiralty Bay
Admiralty Bay, King George Island, South Shetland Islands, Antarctica: a glacial fjord bay opening to Bransfield Strait, about 120-150 km2, up to roughly 600 m deep, fed by twenty marine-terminating glaciers, designated ASMA No. 1 with Brazilian, Polish, and Peruvian stations.
Adriatic Sea
Adriatic Sea (Mare Adriatico, Jadransko more), arm of the Mediterranean between Italy and the Balkans, ~800 km long, 138,516 km², shallow north vs. 1,244 m deep south, bora/sirocco winds, Venice acqua alta, Po eutrophication.
Adycha
Adycha (Адыча), 715 km river in northern Yakutia, Russia; largest right tributary of the Yana, rising in the Chersky Range, snow- and rain-fed, navigable 223 km, with gold placers and changing flow since the 1990s.
Aegean dispute
Aegean dispute: long-running Greece-Turkey conflict over the Aegean Sea's continental shelf, EEZ, territorial waters, airspace, island demilitarization, and islet sovereignty, marked by the 1976 ICJ case, 1987 and 1996 crises, and the 2023 Athens Declaration.
Aegean Drainages
Aegean Drainages (FEOW ecoregion 424) is a temperate coastal-river freshwater ecoregion of southeastern Greece and Aegean islands, defined by Abell et al. 2008, with main rivers Spercheios, Asopos, and Boeotic Kifissos and disputed boundaries.
Aegean Sea (Αιγαίο Πέλαγος)
The Aegean Sea (Greek Αιγαίο Πέλαγος, Turkish Ege Denizi) is an arm of the Mediterranean between Greece and Asia Minor, dotted with Greek islands and the cradle of early Greek civilization.
Aerenchyma
Aerenchyma is plant tissue with enlarged, interconnected gas spaces that transport oxygen to flooded roots. Forms lysigenously, schizogenously, or expansigenously; key to wetland adaptation, crop flooding tolerance, and methane venting.
African Great Lakes
The African Great Lakes are seven rift-valley lakes (Victoria, Tanganyika, Malawi, Turkana, Albert, Edward, Kivu) across ten countries, holding about a quarter of Earth's surface fresh water and famed for cichlid diversity and fisheries.
Agulhas Current
The Agulhas Current is the strong, warm western boundary current of the southwest Indian Ocean and the Southern Hemisphere's strongest, flowing along South Africa's east coast.
Agulhas Plateau
Agulhas Plateau, an oceanic large igneous province plateau in the Southwest Indian Ocean about 1000 km southeast of Cape Town; formed 100–94 Ma with Maud Rise and Northeast Georgia Rise at the Bouvet triple junction; overthickened 20 km oceanic crust; drilled by IODP Expedition 392.
Ajajú
Ajajú (Ajaju River, Rio Ajaju) is a river in Guaviare Department, Colombia, a tributary of the Apaporis within the Amazon basin; its source marks the Meta-Guaviare-Caquetá tripoint.
Akyatan Lagoon
Akyatan Lagoon (Akyatan Lagünü), Turkey's largest lagoon, is a choked, temporarily hypersaline coastal lagoon in Karataş, Adana, on the Mediterranean. Ramsar site no. 943 since 1998 (14,700 ha), it hosts 250+ bird species, wintering flamingos, and major green sea turtle nesting beaches.
Alaknanda River
Alaknanda River, Himalayan headstream of the Ganga in Uttarakhand, India, rising at the Satopanth and Bhagirathi Kharak glaciers; flows ~190–213 km through Chamoli, Rudraprayag and Pauri Garhwal, joins the Bhagirathi at Devprayag, and passes the Panch Prayag confluences.
Alaskan Coastal
Alaskan Coastal: the shoreline and marine zone of Alaska, the longest U.S. coastline at 66,000 miles, spanning five large marine ecosystems, major fisheries, and rapidly eroding permafrost coasts.