Individual #Rio_Grande__Rio_Bravo  a North American river; boundary between the United States and Mexico; flows into Gulf of Mexico
  instance of:  #river
  part of:  #Mexico__United_Mexican_States  a Republic in southern North America; became independent from Spain in 1810
     part of:  #North_America  a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama
        part of:  #northern_hemisphere  the hemisphere north of the equator
        part of:  #western_hemisphere__westernhemisphere__occident__New_World  the hemisphere that includes North and South America
        part of:  #the_Americas__America  North and South America
  part of:  #USA__United_States_of_America__United_States__America__US__U.S.__U.S.A.  North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776
     part of:  #North_America  a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama

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