Created in 2001, Mariato District is a district in the southeastern corner of Veraguas Province in Panama. The district seat is the town of Llano …Created in 2001, Mariato District is a district in the southeastern corner of Veraguas Province in Panama. The district seat is the town of Llano del Catival, also known simply as Mariato. Geographically, the district totaling 1,381 km² comprises the west-facing coast of the Azuero peninsula fronting the Gulf of Montijo. It shares the peninsula with Los Santos and Herrera Province, separated by a crest of low mountains, the Macizo de Azuero. The highest peak is Cerro Hoya in the far south.