Ob

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

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What Wikipedia says

The Ob (; Russian: Обь) is a major river in Russia. It is in western Siberia, and with its tributary the Irtysh forms the world's seventh-longest river system, at 5,410 kilometres (3,360 mi). The Ob forms at the confluence of the Biya and Katun which have their origins in the Altai Mountains.

Excerpt from the Wikipedia article “Ob”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ondřej Žváček, CC BY 2.5, via Wikimedia Commons.