Key:ref:gwlnr
| ref:gwlnr | 
| Description | 
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| Gewässerlaufnummer (Switzerland) | 
| Group: References | 
| Used on these elements | 
| Useful combination | 
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| Status: in use | 
| Tools for this tag | 
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ref:gwlnr=* is used to provide the rivers with the uniform numbering within Switzerland. The key is appended to waterway=* or added to the river-relation.
As described on the German Wikipedia, the reference numbers have the form "AG0034220003" with a two letter code for a Swiss canton followed by a number.
References
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