Sentence:  "In the 1860s, the lands beyond the <WSD>Kuban</WSD> were settled by Black Sea and Line Cossacks from areas populated earlier..." 
Meaning of the word marked with <WSD> tags:  a river in Russia, in the North Caucasus region. It flows through the Karachay-Cherkessia, Stavropol Krai Krasnodar Krai, and Adygea.