Entry for the TJ Waste sponsored 2026 Portsmouth Coastal Waterside events. Waterside Marathon , Festive Half or 12km of Christmas Special.

The Portsmouth Coastal Waterside Marathon offers a stunning, festive running experience along the scenic south coast.

With three race options — a half marathon, full marathon, and 12km special event — runners of all levels can take on this super flat, multi-terrain course. The route winds along the shores of Langstone Harbour, where the muddy yet magical landscape creates a unique coastal backdrop.

Expect fully stocked aid stations, enthusiastic support, and awesome medals at the finish line. Whether you're chasing a PB or embracing the festive spirit, this race is the perfect winter challenge in a breathtaking seaside setting.