Slidr Sulci is a major tectonic fault on Neptune's largest moon Triton.

The fault is named after the River Sliðr of Norse mythology, whose waters in Hel are filled with swords.

The name Slidr Sulci was officially approved by the International Astronomical Union (IAU) in 1991.

The ridges may have been created through a sequence of eruptions of viscous cryolava in pre-existing faults and grabens.

That Slidr Sulci only partially covers Kasyapa Cavus implies multiple stages of formation of either structure, possibly explained by cryovolcanic eruptions from a single vent.