The Cașin is a right tributary of the river Râul Negru in Romania.

[1][2] It discharges into the Râul Negru in Catalina.

[3] It flows through the villages and towns Plăieșii de Sus, Plăieșii de Jos, Iacobeni, Valea Seacă, Sânzieni, Târgu Secuiesc and Catalina.

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