Sakai is a city steeped in history and culture, located in Osaka Prefecture, Japan. Known for its significant seaport, it has been a vital part of Japan's maritime activities since medieval times. The city is also famous for its kofun, ancient keyhole-shaped burial mounds, including the Daisen Kofun, recognized as the largest grave in the world by area. Today, Sakai continues to be known for its high-quality cutlery, a tradition that harks back to its past when it was renowned for sword making.