#Hoover_Dam  a large dam on the Colorado River in Nevada
  supertype:  #dike__dam__dyke__levee  a barrier constructed to contain the flow or water or to keep out the sea
  part of:  #Nevada__Silver_State__Battle_Born_State__Sagebrush_State__NV  a state in the western United States
     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
           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

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