This portion of Mexico that forms the relatively narrow land mass between Mexico City and the Yucatan Peninsula is called the Isthmus of Mexico. It consists of three states, Oaxaca, in the west, Chiapas in the east, and Guerrero in the west. This is a double-sided map, stretching from west of Acapulco to beyond the border with Guatemala along the Pacific coast, and from Veracruz to Carmen along the Gulf of Mexico coast. It is the part of Mexico containing numerous holiday resort areas for sun-lovers, but is also rich in history and attractive colonial-era towns. Oaxaca City is a UNESCO World Heritage site, as is the Mayan temple site of Palenque.