Isthmus of Tehuantepec Between Gulf of Mexico and Pacific Ocean, Mexico17.5N 94.5W
The Isthmus of Tehuantepec is an isthmus in Mexico. It represents the shortest distance between the Gulf of Mexico and the Pacific Ocean. At its narrowest point, the isthmus is 200 km (120 mi) across from gulf to gulf, or 192 km (119 mi) to the head of Laguna Superior on the Pacific coast. The northern side of the isthmus is swampy and densely covered with jungle.
The Sierra Madre breaks down at this point into a broad, plateau-like ridge. Since Sierra Madre de Oaxaca mountains flatten out to form Chivela Pass before the Sierra Madre de Chiapas mountains resume to the south, geographically the isthmus divides North America from Central America.