| 11. | The boundaries of the regions are based largely on drainage basins.
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| 12. | The drainage basin of the Uruguay River has an area of.
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| 13. | It occupies the drainage basin of the rivers Lea and Artibai.
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| 14. | It is on Tophet Creek in the James Bay drainage basin.
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| 15. | There are glaciers in the four major drainage basins of Switzerland.
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| 16. | The region is located in the drainage basin of Vltava river.
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| 17. | The commune is located in the drainage basin of the Adour.
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| 18. | The drainage basin to the west is the Rosebud Creek basin.
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| 19. | Its drainage basin ( watershed area ) of 2, 646 km?
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| 20. | The commune is located in the Drainage basin of the Adour.
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