Libmanan River is a major waterway in the province of Camarines Sur in the Bicol Region of the Philippines that flows into San Miguel Bay.[ Libmanan River] sa [ Geonames.org (cc-by)]; post updated 2012-01-17; database download on 2015-11-25 Approximately 83 kilometers in length, it acts as a left tributary and major system feeding into the Bicol River basin. Originating from the slopes of Mount Labo, the river flows southeast, eventually joining the Bicol River in the town of Libmanan.Umali, Pepe San Miguel.The Story of Libmanan is the Story of the River Dateline Ibalon
In 2021, the river was listed among the top plastic waste carriers in the world.Pasig river, other Philippine rivers among top plastic waste carriers in the world, says study Philippine Star
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