Sumo at Sea (challenge)

Survivor Sumo (officially known as Sumo at Sea, Kung Fu Cannibals and Sumo in Mud) is a recurring challenge that originated in and was used in later seasons.

Rules
One member from both tribes face off in an arena surrounded by either water or mud ( and ). Using their sandbags, or any other body part other than their hands, they must try to knock each other out of the arena.

History
In, its debut season, Koror narrowly managed to beat out Ulong for immunity.

The challenge reappeared as a reward challenge in. Moto won, taking home fishing gear, toiletries, coffee and potatoes.

The Heroes won this challenge in. In addition to Immunity, the tribe also won rice, sugar, coffee and the tribe's luxury items.

Trivia

 * Tom Westman is the only person to participate in this challenge twice.
 * In both seasons, his tribe won the challenge.