The Bay Area is the entire region surrounding the San Francisco Bay, including the Peninsula, East Bay, San Francisco, and North Bay, so it covers much more land area than Silicon Valley. In practice, software companies have outgrown Silicon Valley proper. Many companies are now based throughout the Bay Area.
Marathi Mumbai (the former Bombay), capital of Maharashtra state in India, port to the Arabian Sea and one of the most densely populated cities in the world. More about Mumbai. Searchable map/satellite view of Mumbai.
Dhaka is the densest city in the world, the traffic jam here is awful. Bangladesh always at the top or close to that spot for most corrupted country in the world and the list can go on. Despite the all these negative aspects Bangladesh is unique in its own way.