Triads

  
 

 

 

 
  • Source --- Mouth --- Tributary (River)
  • City --- Suburb --- Country
  • Peninsula --- Island --- Archipelago
  • Mountain --- Valley --- Plain
  • Ocean --- Sea --- Lake
  • Climate --- Weather --- Temperature
  • Neighborhood --- District --- Community
  • Regional --- National --- International
  • Renewable resources --- Non-renewable resources --- Sustainable development