  Saturn's moon Iapetus has an equatorial ridge system, which may be as high as
20 km, that may have formed by endogenic forces, such as tectonic and
convective forces, or exogenic processes such as debris infall. We use
high-resolution topographic data to conduct a topographic analysis of the
ridge, which suggests a predominantly triangular morphology, with some ridge
face slopes reaching 40 degrees, allowing for an exogenic formation mechanism.
