By Cody O'Keeffe Rivers, Lakes, and Seas of Ireland.

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Across
  1. 3. The middle river in the three sisters.
  2. 6. The body of water to the north east of Ireland.
  3. 7. The sea to the south of Ireland.
  4. 8. The longest river in Ireland.
  5. 10. The sea to the east of Ireland.
Down
  1. 1. The largest lake in Ireland.
  2. 2. The biggest lake on the Shannon.
  3. 4. The river that was named after a battle.
  4. 5. There are three rivers with this name.
  5. 9. It is a tributary to the river Shannon.