Tehuantepec Isthmus of

Te·huan·te·pec

 (tə-wän′tə-pĕk′, tĕ-wän′tĕ-), Isthmus of
An isthmus of southern Mexico between the Bay of Campeche and the Gulf of Tehuantepec, a wide inlet of the Pacific Ocean.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.