The results here are not 100% perfect: some errors in the Digital Elevation Model used (ASTER) may tag the river as backwards whereas it is not; these errors represent <1% of the results.
A simple way to check that the river is in the correct way is to see the surroundings. In general the river will flow towards a bigger river or the sea.
You can click on JOSM to load the way into JOSM (needs the prefs->remote to be enabled). The OSM link shows the way into OpenStreetMapIf questions: firstname.lastname@example.org
|Way id||links||Node start id
|Node end id
|lat start node||lon start node|