Oxbow

noun (countable)

/ˈɒksbəʊ/

A crescent-shaped lake formed when a pronounced meander loop of a river is cut off from the main channel by the breaching of the narrow neck between two bends during flood conditions, leaving the isolated curved segment as a standing water body. Also called a cut-off lake or meander lake, oxbows are common on the floodplains of mature rivers. In India, the Ganga–Brahmaputra delta and the Terai zone have numerous oxbow lakes (locally called chaurs in Bihar and beels in Assam), which are ecologically important wetlands.

✍️ Usage in a UPSC answer

The Assam floodplain's beels — oxbow lakes formed by successive channel avulsions of the Brahmaputra — serve as critical nursery habitats for the Gangetic river dolphin (Platanista gangetica), a Schedule I species under the Wildlife Protection Act, 1972.

Synonyms

cut-off lakemeander lakebillabong (Australian English)horseshoe lakeabandoned meander

Antonyms

active meandermain channelthalwegconfluence

🌱 Word Family

oxbow (noun), oxbow lake (compound noun), cut-off lake (synonym compound), meander scar (related compound)

🔡 Root

Old English oxa = ox + boga = bow, arc; from the U-shaped wooden collar fitted around an ox's neck

📜 Etymology

The term derives from the Old English words oxa (ox) and boga (bow or arc), referring to the U-shaped wooden frame that fits under an ox's neck as part of a yoke. The shape of this yoke is identical to the curved form of an abandoned meander. The geographical usage developed in American English in the 19th century, with 'oxbow' first recorded in geological and geographical literature around the 1830s–1840s.

🧠 Memory Hook

OXBOW = shaped like the BOW (yoke) placed around an OX's neck — a perfect U-curve. When a river cuts across the neck of a meander, the U-shaped bend is abandoned and becomes a still lake shaped exactly like that ox-yoke.

🌍 Geography 📖 Seen in: Plate Tectonics & Volcanism — Continen...

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