| 41. | The drainage basin of the river covers an area of.
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| 42. | The Champlain Valley makes up most of the drainage basin.
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| 43. | Its drainage basin has an area of 17, 323 km?
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| 44. | In the drainage basin of the Dordogne, the Perigordian prevailed.
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| 45. | Mount Airy straddles the division of two major drainage basins.
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| 46. | The Voronezh River is long, with a drainage basin of.
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| 47. | The area of its drainage basin is 2, 227 km?
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| 48. | I came to that drainage basin two years ago and paddled left, into the sunset.
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| 49. | The Dospat has a drainage basin of 633.5 km?
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| 50. | The environment in the Abert drainage basin is semi-arid.
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