rivers puzzle

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Across
  1. 5. what do you call a big rocky formation
  2. 6. another word for estuary or tributary
  3. 7. another name for river
  4. 9. what do you call the area where a river flows into the ocean
  5. 11. an area of land where all flowing water converges to a single point_(got that from Wikipedia)
Down
  1. 1. what do you call when two or more bodies of water combine to form a single channel
  2. 2. what do you call the place where rivers flow into each other
  3. 3. another word for source
  4. 4. what do you call the beginning of a river
  5. 8. a thing that starts with C
  6. 10. what do you call a narrow stream of water?