The natural features

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Across
  1. 5. Flowing water
  2. 6. The small river joining the main river.
  3. 9. A flat and high land.
  4. 10. The place where the tributary joins the main river.
Down
  1. 1. The place where the river enters the sea.
  2. 2. The place where a river starts.
  3. 3. A flat and low land.
  4. 4. A narrow and elongated land with a chain of hills.
  5. 7. The sea between the beach and the reef.
  6. 8. The slopes between the mountains.
  7. 9. The highest point of a mountain.