Castelia City is a large seaside city located in south central Unova. Unlike other cities, Castelia is a huge, sprawling metropolis, sporting many towering skyscrapers and other tall buildings. It is the heart of business and economy of the Unova region, as opposed to its sister city, Nimbasa City, which is the heart of leisure and entertainment. Most of its city streets are crowded with different people rushing around, trying to get to work, home, or other places, creating a hustle and bustle scene for city life. The city exists on the bottom of Unova's central peninsula, south of the desert and north of the sea, making for a perfect harbor city. Castelia City is based on the island of Manhattan, which is one of the five New York City boroughs. It is also based particularly on Lower Manhattan.