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As I understand,first of all I should to get the country's map and the river's list. To get country map is simple:

GeoGraphics[Polygon[Entity["Country", "Belarus"]]]

Also I get the list of all world rivers:

EntityList["River"]

but I can't get the list of rivers in some country(for example, Belarus). I have tried to use such functions as GeoEntities, EntityList, etc. But, there are not any results. Could you help me? Thank you in advance (and I am sorry for my English:)

bbgodfrey
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Oksana
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  • Welcome to Mathematica.SE! I suggest that: 1) You take the introductory Tour now! 2) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! 3) As you receive help, try to give it too, by answering questions in your area of expertise. – bbgodfrey May 12 '15 at 18:46
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    You may try the U.S. Geological Survey database – xslittlegrass May 12 '15 at 19:50
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    Some river entities in the list contain information as to the countries traversed by that river (e.g. Entity["River","Dnieper"]["Countries"] returns {Entity["Country", "Russia"], Entity["Country", "Belarus"], Entity["Country", "Ukraine"]} ). You could map Entity["River", #]["Countries"]& on the list generated by EntityList["River"], then select those that contain Belarus, but it will be very slow! Alternatively, you might consider using the list of rivers on Wikipedia as a starting point (imported via WikipediaData["List_of_rivers_of_Belarus"]), but it will need manual(?) cleaning. – MarcoB May 12 '15 at 19:51
  • You can try CTRL+= rivers in belarus. – chuy May 12 '15 at 20:02
  • WolframAlpha["rivers in belarus", {{"Result", 1}, "FormattedData"}, PodStates -> {"Result__More"}] – Lou May 12 '15 at 20:02
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    Thank you all for your answers!!!But.as it turned out,"mathematica" has not class "Rivers"(concerning Belarus).It has classes "Lakes","Cannals". – Oksana May 18 '15 at 20:49

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