Nakasu is the red-light district of Fukuoka, Fukuoka Prefecture, Japan, located between the Naka River and Hakata River. The neighborhood was naked for a short-lived entertainment quarter of Edo that existed in the late 18th century, and its name means "the island in the middle." Nakasu is home to over 3,500 restaurants and stores and regularly attracts 60,000 visitors every night, making it the largest red-light district in western Japan after Osaka's Dotonbori. The district was the site of a 2012 gang war between the Yamagasa-gumi and Tojo-kai amid the 2012 Tojo-Omi war.