Pedro Juan Caballero, the capital of the department, is still known by its old name, Punta Porá, used by the traveling merchants that transported yerba from Mato Grosso to Concepción.
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The Creataceous volcanism did also created minor outcrops of potassic alkaline volcanics in a graben structure developed between Asunción and Villarrica and in Amambay Department.