The houses stand about the Alte Nahebrücke bridge, which was designed of stone in 1300. Standing on 8 supporting columns (identified as “piers”), it spans The 2 arms with the Nahe river flowing from the city: the Nahe as well as Mühlenkanal - a channel of h2o giving the mill. https://www.social-bookmarking.org/de/immobilienmakler-in-bingen-ihr-partner-fuer-immobiliengeschaefte-am-rhein