東京2020マラソンスイミング・テストイベント In Tokyo Courtesy of Japan Swimming Federation, Odaiba Marine Park, Tokyo Bay, Japan. The Tokyo 2020 Marathon Swimming Test Event (東京2020マラソンスイミング・テストイベント in Japanese) is a 5 km open water swimming competition held in Odaiba Marine Park (お台場海浜公園 in Japanese), a popular Tokyo tourist and entertainment location on Tokyo Bay, Japan. The event functions as […]