The Boiling Rock is a maximum-security prison located within a boiling lake (hence, the name) in the middle of a seemingly lifeless island. It's also the most modern prison in the Fire Nation. Its walls are extremely thick and made of the most up-to-date indestructible metal. Among its highlights is the gondola system which is the only way on and off the prison island and the most isolation chambers called "coolers". Prisoners can not escape swimming in the lake (as they will be severely burned). Those who try to escape in any other way are thrown into the coolers.