Section of alluvium at the Blue Ribbon Mine in Alaska
Alluvium deposits in the Gamtoos Valley in South Africa
Alluvial river deposits in the Amazon Basin, near Autazes, AM, Brazil. The seasonal deposits are extremely fertile, and crucial to subsistence farming in the Amazon Basin along the river banks.

Alluvium (from the Latin alluvius, from alluere, "to wash against") is loose, unconsolidated (not cemented together into a solid rock) soil or sediments, which has been eroded, reshaped by water in some form, and redeposited in a non-marine setting.[1][2] Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. When this loose alluvial material is deposited or cemented into a lithological unit, or lithified, it is called an alluvial deposit.[3]


The term "alluvium" is not typically used in situations where the formation of the sediment can clearly be attributed to another geologic process that is well described. This includes (but is not limited to): lake sediments (lacustrine), river sediments (fluvial), or glacially-derived sediments (glacial till). Sediments that are formed or deposited in a perennial stream or river are typically not referred to as alluvial.[3]

Other Languages
العربية: طمي
azərbaycanca: Allüvi
беларуская: Алювій
беларуская (тарашкевіца)‎: Алювій
български: Алувий
català: Al·luvió
čeština: Naplavenina
Cymraeg: Llifwaddod
dansk: Alluvium
Deutsch: Alluvialboden
eesti: Jõesete
español: Aluvión
Esperanto: Aluvio
euskara: Alubioi
فارسی: آبرفت
français: Alluvion
Gaeilge: Tuiltreach
한국어: 충적층
Հայերեն: Բերուկ
हिन्दी: जलोढ़क
hrvatski: Aluvij
Bahasa Indonesia: Alluvium
italiano: Alluvione
עברית: סחף
Basa Jawa: Aluvial
ქართული: ალუვიონი
қазақша: Аллювий
Кыргызча: Аллювий
latviešu: Alūvijs
lietuvių: Aliuvis
magyar: Hordalék
മലയാളം: എക്കൽമണ്ണ്
მარგალური: ალუვიონი
Bahasa Melayu: Aluvium
Nederlands: Alluviaal
日本語: 沖積層
norsk: Alluvium
norsk nynorsk: Alluvial
occitan: Alluvion
oʻzbekcha/ўзбекча: Allyuviy
polski: Aluwium
português: Aluvião
română: Aluviune
русский: Аллювий
slovenčina: Fluviálny sediment
srpskohrvatski / српскохрватски: Aluvij
suomi: Alluviaali
svenska: Alluvium
тоҷикӣ: Аллювий
Türkçe: Alüvyon
українська: Алювій
Tiếng Việt: Bồi tích
中文: 沖積層