Underi Fort is an island fortification which is located in the district of Raigad in the state of Maharashtra. The fortress is also known as Jaidurg and is situated near the Mumbai harbour towards the south of Prong's Lighthouse. The geographical coordinate is latitude 18°42'25?N 72°50'32?E. Underi Fort was founded in 1680 CE by Kahim of the Siddis. The fortification serves as a sister fort of the Khanderi Fort which is also located in Raigad district. The fort of Underi is comparatively smaller than the structure at Khanderi.

The islands of Underi and Khanderi were used as landmarks for shipping vessels entering Mumbai harbour. Underi Fort presently lies in a dilapidated condition. It is now open to all tourists and is maintained by the Government of India.

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