Osaka prefecture located in the center of Kinki region in the Midwest Japan covers the smallest prefecture area in Japan, but boasts the largest population and highest population density second only after the capital, Tokyo. Mountains surround three sides of the prefecture and the west faces the arc-shaped Osaka Bay. Since it is close to former capitals of Japan Kyoto and Nara, it prospered as an important point for land and water transportation as well as a commercial city. Here you will find the famous Osaka Castle, with its five-layer donjon as its core, sitting on a lawn park that stretches for about 60,000 square meters. During the cherry blossom season in the spring, this park is especially crowded with hanami (cherry blossom viewing) crowd. Osaka's north gate, Umeda, has a gigantic stretch of underground mall that houses many restaurants, fashion and sundry goods stores.