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. Th ...

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 sout ...

and currently lies in

Raigad district Raigad district (), previously Colaba fort, Colaba district, is a district in the Konkan division of Maharashtra, India. The headquarters of the district is Alibag. Other major cities in the district are Panvel, Karjat, Navi Mumbai, Khopoli, Sh ...

Maharashtra Maharashtra () is a state in the western peninsular region of India occupying a substantial portion of the Deccan Plateau. It is bordered by the Arabian Sea to the west, the Indian states of Karnataka and Goa to the south, Telangana to th ...

. 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

Siddi The Siddi (), also known as the Sheedi, Sidi, or Siddhi, are an ethno-religious group living mostly in Pakistan. Some Siddis also live in India. They are primarily descended from the Bantu peoples of the Zanj coast in Southeast Africa, most ...

s in 1680 CE.

References

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