*1:See also https://sumita-m.hatenadiary.com/entry/20140714/1405296901 https://sumita-m.hatenadiary.com/entry/20161022/1477152909 https://sumita-m.hatenadiary.com/entry/2019/03/23/034816 https://sumita-m.hatenadiary.com/entry/2022/09/14/015910
*2:See eg. 「日本橋川」http://www.mport.info/kandagawa/bridges/nihonbashigawa.htm https://ja.wikipedia.org/wiki/%E6%97%A5%E6%9C%AC%E6%A9%8B%E5%B7%9D See also https://sumita-m.hatenadiary.com/entry/2020/06/30/112935 https://sumita-m.hatenadiary.com/entry/2023/09/20/124317
