Geographical names with and without the

Fill the blank with the definite article “The” before these place names or leave blank?

  1. Europe
  2. Himalayas
  3. River Danube
  4. Asia
  5. Alps
  6. Spain
  7. Panama Canal
  8. Pacific Ocean
  9. Northern Ireland
  10. Black Sea
  11. Atlantic Ocean
  12. Irish Republic
  13. Bahamas
  14. Mount Etna