Assertion: river's length | /r/HasProperty | the distance
Facets:
Source sentences:
text: In addition to measuring the length of rivers (the distance between the farthest source and the mouth) and the size of the various catchments, geographers searched for the stream which deviated least at the actual confluence, as well as taking into account the successive names of rivers and their tributaries, such as the Rhine and the Aare or the Elbe and the Vltava.