The lord of Yodo played a role in overseeing travel up and down the [[Yodo River]] which connected Fushimi and [[Osaka]]; a special set of piers or stone steps, known as ''tôjin gangi'' and located near the taxation office about 200 meters north of the castle, were set aside for the exclusive use of [[Korean embassies to Edo]], as they boarded or disembarked from riverboats they used to travel up and down the Yodogawa.<ref>Explanatory plaques at the former site of Yodo castle.[https://www.flickr.com/photos/toranosuke/45652539075/sizes/k/]</ref>