Explanations:Mumbai, the capital city of Maharashtra, is a unique geographical entity in India. Historically, Mumbai was formed by the confluence of seven islands: Colaba, Old Woman's Island (also known as Little Colaba), Bombay Island (the largest), Mazagaon, Parel, Worli, and Mahim. These islands were originally separated by water bodies and were gradually connected through land reclamation and the construction of causeways and bridges.
The process of connecting these islands began in the 18th century and continued into the 20th century. The most significant development was the construction of the Backbay Reclamation Scheme in the 1920s, which connected the islands of Colaba, Bombay Island, and Worli. This project was a major engineering feat that transformed the city's geography and facilitated its growth into a bustling metropolis.
Understanding the geographical layout of Mumbai is crucial for comprehending its urban development and the challenges it faces. The city's unique formation has influenced its infrastructure, transportation systems, and even its cultural identity. The historical context of the seven islands is often highlighted in discussions about Mumbai's history and development, making it a significant geographical feature to remember.
Other cities mentioned in the options, such as Port Blair, Kavaratti, and Puducherry, are important in their own right but do not share the same geographical characteristic of being composed of seven islands. Port Blair is the capital of the Andaman and Nicobar Islands, Kavaratti is the administrative capital of Lakshadweep, and Puducherry is a union territory with a rich cultural heritage, but none of these cities are known for being formed by seven islands.
Thus, the correct answer to the question is Mumbai, as it is the only city among the options that is historically and geographically known to be composed of seven islands.