Underi (also called Jaidurg) is a fortified island near the mouth of

Mumbai harbour Mumbai Harbour (also English; Bombay Harbour or Front Bay, Marathi''Mumba'ī bandar''), is a natural deep-water harbour in the southern portion of the Ulhas River estuary. The narrower, northern part of the estuary is called Thana Creek. The ...

south of Prong's Lighthouse. It is a companion fort to

Khanderi Khanderi (officially ''Kanhoji Angre island'') is an island with a fort, located south of Mumbai, along the coast of Maharashtra, India. Location Khanderi is located 5 km off the coast of Maharashtra (off Thal, Kihim) and 20 km south ...

and currently lies in

Raigad district Raigad district (Marathi pronunciation: �aːjɡəɖ, previously Colaba district, is a district in the Konkan division of Maharashtra, India. The district was renamed to Raigad after the fort that was the first capital of the former Marath ...

, Maharashtra. These islands of Khanderi and Underi served as one of the landmarks for ships entering

. Underi is smaller than Khanderi. The fortification was built by Kahim of the Siddis in 1680 CE.

References

{{Forts in India Forts in Raigad district Islands of Maharashtra