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The Pasi\u00f3n River originates in Guatemala's Sierra de Santa Cruz. It flows northwestward and, along with the Chixoy River, forms the Usumacinta River. The Usumacinta River then continues to form the border between Mexico and Guatemala before emptying into the Bay of Campeche. The Pasi\u00f3n River itself is a tributary that contributes to the Usumacinta's formation.12

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2 Britannica Sources
  1. Usumacinta River
  2. Chixoy River

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