Rivers, lakes and lochs

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Across
  1. 3. known for its incredible blue water(L)
  2. 6. a womble and in a song(R)
  3. 7. long reigning Queen (L)
  4. 9. Irish police(L)
  5. 10. 25% of Canadians live within its watershed (L)
  6. 12. the monster lake(L)
  7. 14. also known as Isis (R)
  8. 15. Flows to Dublin Bay(R)
  9. 16. flows through 6 Asian countries (R)
  10. 17. a bit scary (L)
  11. 18. featured in a death(R)
Down
  1. 1. often referred to as Blue (R)
  2. 2. better than the others (L)
  3. 4. sample the port along the way(R)
  4. 5. mud pie?(R)
  5. 8. longest river in the world to flow entirely within one country (R)
  6. 9. holiest river in Hinduism (R)
  7. 11. well known online seller(R)
  8. 13. longest river in GB (R)
  9. 16. tennis player or perhaps a mint (R)