Mumbai is known as the "City of Seven Islands" because it was established on the site of an earlier archipelago.
An earlier archipelago that included the Isle of Bombay, Parel, Mazagaon, Mahim, Colaba, Worli, & Old Woman's Island.
Before the British connected the seven islands that made up Bombay, which allowed for a succession of reclamations and infills, the city was actually seven separate islands.
Bombay was made up of "seven islands": Colaba, Mazagaon, Mahim, Parel, Bombay Island, Worli, and Old Woman's Island.
The renowned Buddhist ruler of India known as Ashoka ruled over these collection of islands as part of his empire.
In order to join the islands into one land, the British people constructed many causeways and engaged in extensive land reclamation.
During the course of five centuries, a group of islands known as the seven islands of Bombay were joined to form the territory of the contemporary metropolis.
With the help of land reclamation initiatives, the seven islands were eventually physically linked.