第30回 館山OWSフェスティバル（貴田杯）兼 第80回 国民スポーツ大会OWS千葉県代表選手選考会

The Tateyama OWS Festival is an open-water swimming event announced by the Chiba Swimming Federation and held at Hojo Beach in Tateyama City, Chiba Prefecture. The event is also associated with the Kida Cup and includes related open-water swimming programming such as the Hiromi Kida OWS Clinic (Y海‘School) and certification activities. It is connected with the Japan Swimming Federation certified OWS circuit series, giving the event a formal competitive context within the domestic open-water swimming calendar. Registered Japan Swimming Federation athletes are also able to enter through Web-SWMSYS, indicating that the event serves both general open-water participants and more competition-oriented swimmers. One of the competitive races also functions as a Chiba Prefecture selection event for the National Sports Festival, making the festival an important opportunity for local athletes aiming to represent the prefecture. The coastal setting at Hojo Beach provides the defining venue context for the festival, with the event organized through the prefectural swimming federation and supported by published race materials, updates, start lists, results, and participant notices.