I've noticed there's a really small number of flowing water on Kerbin and managed to count only 8 systems and out of those, only 1 that's not flowing into the ocean.
(map printed from Temporary Kerbal maps; numbers are in rough order of system size)
Closeups, taken at the penultimate map enlargement.
I think we should get proper, officially supported toponyms for all significant geographical features on Kerbin so that lore connection between players can occur. Kerbin is truly underappreciated planet, but offers the most.
It seems to me these drainage basins are the most scarce ones so it might be a good idea to start with them. Hopefully, one day the names will get official.
Any ideas? They could be kerbalized Earth's hydronyms or something you made up. Use the numbers from the map and suggest a name.