The Lee Valley Run Fest is a standout event in the UK’s race calendar, offering a fast and scenic 10K and half-marathon set within the heart of Hertfordshire’s stunning regional parkland. Both distances start and finish at the Olympic legacy site, the Lee Valley White Water Centre—an iconic venue from the 2012 Games. The traffic-free, flat course winds along beautiful trails and riverside paths, making it ideal for chasing a PB while enjoying peaceful natural surroundings. Known for its smooth organization, clear signage, and enthusiastic marshals, the event consistently receives top ratings from runners. Expect vibrant race-day energy, with music, cheering supporters, and a welcoming atmosphere for both beginners and seasoned competitors. Post-race perks include a bespoke medal, snacks, and a friendly festival vibe that makes the finish area a true celebration.