knowing rivers

 we could use games to know the location of long rivers and tall peaks

if we mimic the border of japanese manchuria:
soviet amur, japanese amur, j-jjang, j-nan,

note: on date 22 april i improved this list so see

https://thinkforyourselfn8.blogspot.com/2021/04/name-region-improved-physical-geography.html

ob rr, n, replaced at link above.