country tulum 
Quintana Roo , officially the Free and Sovereign State of Quintana Roo , is one of the 31 states which , with the Federal District , make up the 32 federal entities of ___MASK54___ . It is divided into ten municipalities and its capital city is Chetumal . ___MASK54___ (, modern Nahuatl ), officially the United Mexican States , is a federal republic in the southern half of North America . It is bordered to the north by the United States ; to the south and west by the Pacific Ocean ; to the southeast by Guatemala , Belize , and the Caribbean Sea ; and to the east by the Gulf of ___MASK54___ . Covering almost two million square kilometers ( over 760 , 000 sq mi ), ___MASK54___ is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world . With an estimated population of over 120 million , it is the eleventh most populous country and the most populous Spanish - speaking country in the world while being the second most populous country in Latin America . ___MASK54___ is a federation comprising 31 states and a federal district that is also its capital and most populous city . Other metropolises include Guadalajara , Monterrey , Puebla , Toluca , Tijuana and León . The Caribbean Sea is a sea of the ___MASK34___ in the tropics of the Western Hemisphere . It is bounded by ___MASK54___ and Central America to the west and south west , to the north by the Greater Antilles starting with Cuba , to the east by the Lesser Antilles , and to the south by the north coast of South America . Tulum ( Yucatec : " Tulu ' um ") is the site of a pre - Columbian Mayan walled city serving as a major port for Cobá . The ruins are situated on tall cliffs , along the east coast of the ___MASK44___ Peninsula on the Caribbean Sea in the state of Quintana Roo , ___MASK54___ . Tulum was one of the last cities built and inhabited by the Maya ; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying ___MASK54___ . Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities , disrupting the society and eventually causing the city to be abandoned . One of the best - preserved coastal Maya sites , Tulum is today a popular site for tourists . Chetumal ( Modern Maya : " Chactemàal " , " Place of the Red Wood ") ( coordinates : ) is a city on the east coast of the ___MASK44___ Peninsula in ___MASK54___ . It is the capital of the state of Quintana Roo and the municipal seat of the Municipality of Othón P . Blanco . In 2010 it had a population of 151 , 243 people . Tulum is one of the ten municipalities that make up the Mexican state of Quintana Roo . It became one of the newest municipalities in the country when it was formed on March 13 , 2008 , when it was separated from Solidaridad Municipality . Tulum is home to the Maya archaeological sites of Tulum and Cobá . The ___MASK44___ Peninsula , in southeastern ___MASK54___ , separates the Caribbean Sea from the Gulf of ___MASK54___ , with the northern coastline on the ___MASK44___ Channel . The peninsula lies east of the Isthmus of Tehuantepec , a northwestern geographic partition separating the region of Central America from the rest of North America .