Sakai is a city located in the Osaka Prefecture of Japan. As of January 1, 2022, it had an estimated population of 819,965, ranking as the fourteenth most populous city in the country.
The city has served as one of Japan's largest and most significant seaports since the medieval era. Historically known for its sword production, Sakai is currently recognized for the high quality of its cutlery.
Sakai is also notable for its kofun, which are keyhole-shaped burial mounds dating back to the fifth century. These sites include the Daisen Kofun, which is identified as the largest grave in the world by area.