P-34689 Range : 130,000 km. ( 80,000 miles ) Smallest Resolvable Feature : 2.5 km or 1.5 miles This image of Neptune's moon Triton, shot by Voyager 2, is seen here. The long linear feature exteding vertically across the image is probably a graben -- a norrow down-dropped fault block about 35 km. or 20 miles across. The ridge in the center of the graben. The surrounding terrain is a relatively young icy surface with few impact craters.