Cellular Jail, also known as Kala Pani, is a colonial-era prison located in Port Blair, the capital of the Andaman and Nicobar Islands, India. The jail was constructed in 1896 and was designed to imprison political prisoners from India during British rule.

The jail consists of seven wings, each having three floors with about 698 cells. The cells are small and meant to house a single prisoner. The jail was designed in such a way that prisoners could not communicate with each other, leading to its name "cellular". The jail is a symbol of colonial oppression and has been the site of numerous protests and demonstrations.

The jail was closed in 1947 after India gained independence from British rule. In 1969, the jail was declared a national monument and was opened to the public as a museum. The museum showcases the history of the Andaman and Nicobar Islands and the life of the prisoners who were held in the jail. Visitors can also view the gallows where prisoners were executed and the solitary confinement cells where prisoners were punished.

The Cellular Jail has become a popular tourist destination, attracting visitors from all over India and the world. The jail was also featured in the Bollywood film "Kalapani" which depicted the life of the prisoners in the jail.