River aspect: Travel

Can someone clarify how Travel on the river's back works?

For the first part to me it says I can take up to two Dahan from an area I have Presense first.   Then I look at lands with my presence which are connected and I can place them in any one of those.   If I have board C for example with Presense lands 1, 2, 3, 6, and 8.   If I choose land 1 then I can place those Dahan in any of those locations.  If my Presense was at lands 1,2,3, 7, and 8 then if I pick land 1 I can only move it between lands 1,2, and 3.   If I pick 8 then I can only move it between 7 and 8.    Does that help?

Yes, thanks!