Elephanta Island is located at a 1 hour ferry ride from Mumbai.
Mumbai Street
Geographically, the present day Mumbai's origin was an archipelago formed by seven swampy islands formed. Over the past 400 or so years of its history, these islands were joined and consolidated into the current landmass constitutes Mumbai.
In 1534 the Portuguese acquired the islands through a treaty with the local ruler.
In 1661 these islands came to the British Crown as dowry of the marriage treaty of Charles II of England and Catherine of Braganza, daughter of King John IV of Portugal.
The Crown later leased it to the East India Company, who saw value of its location as a natural harbor in Arabian Sea.
By 18th century it became a major shipbuilding yard on the western coast of Indian peninsula. The trading and industrial opportunities brought very many business communities to this otherwise islands in inhabited by local fishermen folks. That migration lured by the business opportunities gave Mumbai its multicultural genesis.
Though the archipelago is merged largely, you can still see a number of islands off the Mumbai coast. Many of them are out of bounds on security grounds ( like the Middle Ground Coastal Battery , the Oyster Rock, the Butcher Island ). Elephanta Island is a very important heritage destinations with the Elephanta Caves which is a UNESCO World Heritage Site.
Apart from the Gateway of India , the major attractions in Mumbai include the 1903 built Taj Mahal Hotel , the aircraft carrier converted Museum Ship Vikrant , National Gallery of Modern Art , Prince of Wales Museum later renamed as Chhatrapati Shivaji Maharaj Vastu Sangrahalaya, the Jehangir Art Gallery on MG Road, the Flora Fountain in the Fort Area , the Horniman Circle, Chhatrapati Shivaji Terminus ( the erstwhile Victoria Terminus ) , Marine Drive , Chowpatty Beach, Haji Ali’s Mosque, Mahalakshmi Temple, Juhu Beach and so to name a few prime attractions.
If you stretch a bit more , the attractions around Mumbai include Elephanta Caves , the Kanheri Caves and the Sanjay Gandhi National Park near to Kanheri.
A great number of long distance trains in India radiates from Mumbai. So are the international and domestic air connections . That makes Mumbai an ideal gateway point for India.
Elephanta is located 9 nautical miles off Mumbai city.
Elephanta and other caves in Mumbai