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That channel is HUGE. Maybe several km across. The little river networks coming off the bright highlands likely did not contribute those rounded rocks, they came from somewhere else.

The big wide channel seems to originate to the SW (in foreground of the second movie) and go to the NE (to the background in the second movie).

The rocks came somewhere from the E Adiri bright area to the SW of where Huygens landed. Maybe from pretty far away.