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Oaxaca is in one of three adjacent valleys encircled by the majestic Sierra Madre del Sur. Mexico's fifth-largest state is bordered by Chiapas to the east, Veracruz and Puebla to the north, and Guerrero to the west. Southern Oaxaca State is blessed with 509 km (316 miles) of Pacific coastline. By the way, it's pronounced wah-hah-kah.