Tehuantepec

(tə wänt′ə pek′)

arm of the Pacific, off the S coast of Mexico: c. 300 mi (483 km) wide
narrowest part of Mexico, between this gulf & the Gulf of Campeche: c. 125 mi (201 km) wide

See Tehuantepec in American Heritage Dictionary 4

An isthmus of southern Mexico between the Bay of Campeche and the Gulf of Tehuantepec, a wide inlet of the Pacific Ocean.

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