I agree... https://forums.elementalgame.com/430026. I've had this issue logged for awhile. Same with ins and we haven't heard a word whether they know it's a problem or on the list. I don't know how easy this will be to fix, and I can reproduce this effect on any map with raise land. It seems they need to add a end-river tile change for other landscapes besides beaches and cliffs.

Another problem is that it has to also change dynamically if people use spells like raise or lower land around a river. I just think that they are going to ignore this problem until later. I know they have seen the bug report, but aren't saying anything about it.