Lyot is a large peak ring crater in the Vastitas Borealis region of Mars, located at 50.8° north latitude and 330.7° west longitude within the Ismenius Lacus quadrangle. It is 236 km in diameter. Its name refers to Bernard Lyot, a French astronomer (1897–1952).
Viking Orbiter 2 mosaic
Wide view of channels in Lyot crater, as seen by HiRISE unser HiWish program
Close view of channels in Lyot crater, as seen by HiRISE under HiWish program
Close view of channels in Lyot crater, as seen by HiRISE under HiWish program
A peak ring crater is a type of complex crater, which is different from a multi-ringed basin or central-peak crater. A central peak is not seen; instead, a roughly circular ring or plateau, possibly discontinuous, surrounds the crater's center, with the crater rim still farther out from the center.
Raditladi, a relatively young peak-ring crater on Mercury
Barton crater, a peak-ring crater on Venus
Lowell, a peak-ring crater on Mars