The Istmo de Tehuantepec is located in the western most region of Oaxaca. This area is bordered by Veracruz and Chiapas and is part of the narrowest Mexico landmass separating the Gulf of Mexico from the Pacific Ocean.

The Istmo de Tehuantepec phone book contains both Yellow Pages and White Pages. This telephone directory covers several cities in Oaxaca and a few from Veracruz.