The views shown here include perspective views of these putative volcanic features, as well as relaxed craters, smooth plains and narrow sinuous canyons that could be volcanic flow channels. Hopefully Cassini will help answer some of these questions.
Dione: North Polar Region. The large relaxed impact crater is 150 km across. The narrow canyons originate near the north pole and could be lava channels.
Dione: Equatorial Smooth Plains. The irregular pits in the background are 30 to 40 km across and could be volcanic calderas.
Dione: Smooth Plains. The largest crater is 105 km across. Its large central peak towers 3 km above the plains and is a classic indicator of viscous relaxation and a sign that Dione's internal heat flow was once much higher than today.