From the Super Mario Wiki
Mario, Luigi, Toad, Princess Toadstool, Mervin the Magician and several townspeople in Cramalot

Cramalot is a medieval-themed kingdom explored in The Super Mario Bros. Super Show! episode "King Mario of Cramalot". It is based on the legendary kingdom of Camelot from the Legend of King Arthur.

Cramalot resembles general depictions of medieval kingdoms, with a large, towering castle in it, along with a village at the foot of that castle. Cramalot is also surrounded by the Forest of Perpetual Night and Terrible Dangers.

In the town square of Cramalot is the Sacred Sink of Cramalot, which has the Golden Plunger in it; whosoever removes this plunger from the sink would be crowned king of Cramalot.