The Yokosuka Seaside Marathon is one of Kanagawa Prefecture's longest-running and most beloved road races, offering runners the opportunity to experience the maritime scenery and naval heritage of Yokosuka, Japan. Organized by the Yokosuka Seaside Marathon Council (γγγγγ·γΌγ΅γ€γγγ©γ½γ³εθ°δΌ), the event has been held for more than 50 years and attracts thousands of participants each autumn. The race is centered around Yokosuka's waterfront, with the half marathon, 10 km, 3 km, and family events beginning and ending near Yokosuka Kaigan-dori. Participants enjoy sweeping views of Tokyo Bay, Yokosuka Port, and the Miura Peninsula while running on a certified course that combines flat waterfront sections with rolling hills toward Cape Kannonzaki. The race is known not only for its scenic coastal setting but also for its warm local hospitality, enthusiastic volunteers, and post-race atmosphere featuring Yokosuka specialties such as the city's famous Navy Curry.
The half marathon is the event's signature race and has earned a reputation as a rewarding challenge rather than a purely fast course. After an opening stretch along the waterfront, runners encounter a series of gradual climbs and descents through eastern Yokosuka before returning toward the harbor for an energetic finish. The combination of sea breezes, historic naval landmarks, and panoramic ocean views makes the Yokosuka Seaside Marathon one of the most distinctive half marathons in the Greater Tokyo region. Whether participating competitively or simply to enjoy one of Japan's classic seaside running events, runners can expect excellent organization, well-supported aid stations, and a memorable race-day experience that showcases the unique character of Yokosuka.
