bioregion
noun
                                                                                                                            
                                                            bio·re·gion
                    
                                                                                                              
                                                                                                                                  ˈbī-ō-ˌrē-jən  
                                                      
                                                          
            
                                
              
          
                                                      : a region whose limits are naturally defined by topographic and biological features (such as mountain ranges and ecosystems)                                      
                
                    
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  Merriam-Webster unabridged




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