re: *Is* that a surface feature?
"The fact that it is straight from Casinni's vantage, means it would have to be curving *precisely* counter to the spherical foreshortening that we'd otherwise be seeing, which would just be too weird."
Weirdness abounds. I think this is the same feature imaged by Voyager 1 in 1981, and it clearly follows the curve of the satellite