Onjuku is a crescent-shaped beach break located on the Chiba Peninsula coast of Japan, facing northeast toward the Pacific Ocean. The spot features a sandy beach approximately 800 meters wide with rocky headlands anchoring both ends. The northern side is more developed with urban infrastructure, while the southern point shows natural rock formations. Water conditions are generally small with average waves of 1.4 meters, making this suitable for beginners and small-wave enthusiasts. Best kitesurfing conditions occur with northwest winds (315°) providing true side-shore conditions parallel to the beach. The current location shows low wind reliability at 10.2%, suggesting seasonal or inconsistent wind patterns typical of Japan's Pacific coast. The spot is protected from full ocean swell by its orientation and surrounding topography. Kiters should be aware of shallow water near shore, rocky formations, and existing pier/breakwater infrastructure. The beach is accessible but crowded during weekends due to proximity to residential areas. Water temperature averages 17.2°C, requiring a wetsuit year-round.