Ceiça Fervedouro, situated in Mateiros in the Jalapão region of Tocantins, Brazil, is a celebrated natural spring known for its round shape and vibrant surroundings. Visitors can float effortlessly in the clear waters thanks to the strong underground pressure, swim in the refreshing pool, and take memorable underwater photographs. Notably, this was the first fervedouro revealed to the public and continues to be one of the most popular in Jalapão. Surrounded by dense banana trees, the spring offers a striking natural setting, with entry limited to ten people at a time to protect its delicate ecosystem.