Modravský potok
| Modravský potok | ||
| Data | ||
| location | Bohemian Forest , Plzeňský kraj , Czech Republic | |
| River system | Elbe | |
| Drain over | Vydra → Otava → Moldau → Elbe → North Sea | |
| origin | Confluence of Lusenbach and Schwarzbach  48 ° 58 ′ 8 ″ N , 13 ° 29 ′ 10 ″ E  | 
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| confluence | with the Rachelbach to Vydra Coordinates: 49 ° 1 ′ 30 ″  N , 13 ° 29 ′ 47 ″  E 49 ° 1 ′ 30 ″  N , 13 ° 29 ′ 47 ″  E 
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| length | 7.5 km | |
The Modravský potok (German. Maderbach ) is a stream in the Šumava Biosphere Reserve in the Czech Republic .
The brook arises at the northern end of the wasteland Březník ( Pürstling ) from the Luzenský potok ( Lusenbach ) and the Březnický potok ( Schwarzbach ). At Modrava ( Mader ) the Maderbach unites with the Roklanský potok ( Rachelbach ) to the Vydra .