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Sumidero Canyon (Spanish: Cañón del Sumidero) is a canyon located about 40 km from Tuxtla Gutiérrez, capital of the Mexican state of Chiapas. Its cliffs are 900 meters above sea level and overlook the Grijalva River, which extends across the states of Chiapas and Tabasco and flows into the Gulf of Mexico. In its southern entrance, the canyon begins near the city of Chiapa de Corzo, and flows into the reservoir of the hydroelectric dam–Manuel Moreno Torres, best known as Chicoasén.
The importance and cultural symbolism of Sumidero Canyon for Chiapans are so great that its silhouette is the base of the Coat of Arms of the state of Chiapas.