What is Sauer?
{{infobox river | name = Sauer | map = Sûre.png | map_size = | map_caption = Path of the Sauer [http://u.osmfr.org/m/383739/] | image = Fluss_Sauer.jpg | image_size = | image_caption = The Sauer in [[Echternach (town)|Echternach]] | subdivision_type1 = Countries | subdivision_name1 = {{ubl|[[Belgium]]|[[Germany]]|[[Luxembourg]]}} | subdivision_type2 = Location | subdivision_name2 = | subdivision_type3 = Reference no. | subdivision_name3 = DE:&nbsp;262 | length = {{convert|173|km|abbr=on}} | width_avg = | depth_avg = | source1_location = Source region: In the [[Ardennes]] on the soil of [[Libramont-Chevigny]] near the ''Planchipont'' farm ([[Belgium]]) | source1_coordinates = | source1_elevation = ca.&nbsp;{{convert|510|m|abbr=on}} | mouth_location = Between [[Wasserbilligerbrück]] ([[Germany]]) and [[Wasserbillig]] ([[Luxembourg]]) into the [[Moselle]] | mouth_coordinates = {{Coord|49.7135889|6.5066861|type:river_region:DE-RP|format=dms|display=inline,title}} | mouth_elevation = ca.&nbsp;{{Höhe|133|DE-NHN|link=false}} | basin_population = | basin_landmarks = | river_system = Moselle | progression = {{RMoselle}} | basin_size = {{convert|4,259|km2|abbr=on}} | discharge1_location = at its mouth<ref>Added gauge data from Bollendorf (Sauer), [http://213.139.159.46/prj-wwvauskunft/projects/messstellen/wasserstand/register2.jsp?msn=2628050400&pegelname=Pr%FCmzurlay&gewaesser=Pruem&dfue=1 Prümzurlay] {{Webarchive|url=https://archive.today/20120715221121/http://213.139.159.46/prj-wwvauskunft/projects/messstellen/wasserstand/register2.jsp?msn=2628050400&pegelname=Pr%FCmzurlay&gewaesser=Pruem&dfue=1 |date=2012-07-15 }} (Prüm) und [http://213.139.159.46/prj-wwvauskunft/projects/messstellen/wasserstand/register2.jsp?msn=2628085400&pegelname=Alsdorf-Oberecken&gewaesser=Nims&dfue=1 Alsdorf-Oberecken] {{Webarchive|url=https://web.archive.org/web/20160304235318/http://213.139.159.46/prj-wwvauskunft/projects/messstellen/wasserstand/register2.jsp?msn=2628085400&pegelname=Alsdorf-Oberecken&gewaesser=Nims&dfue=1 |date=2