Goods unloaded at the ports in Wakasa Bay were transported via Lake Biwa to Kyoto and Osaka from the point where the river from Lake Biwa running to Osaka Bay became the Yodo-gawa River during those periods when Kyoto was the capital.
琵琶湖が淀川となって大阪湾に流れる位置から、京都が首都だった時代には、若狭湾で陸揚げされた物資が、琵琶湖の湖上交通で京都や大坂に輸送されていた。