Janiculum Dorsa

Caption NASA:"The Cassini spacecraft looks down, almost directly at the North Pole of Dione. The feature just left of the Terminator at bottom is Janiculum Dorsa, a long, roughly North-South trending ridge.
Lit terrain seen here is on the anti-Saturn and trailing sides of Dione (1126 Km, or approx. 700 miles across).

This image was taken with the Cassini spacecraft narrow-angle camera on March 22, 2008 using a spectral filter sensitive to wavelengths of ultraviolet light centered at 338 nanometers. The view was acquired at a distance of approx. 650.000 Km (about 404.000 miles) from Dione and at a Sun-Dione-Spacecraft, or phase, angle of 99°.
Image scale is roughly 4 Km (about 2 miles) per pixel".