TCS London Marathon

Tower Bridge at mile 12 is the moment every London runner talks about. You've heard about it, you've seen the photos — and then you run onto it, and the noise hits you from both sides of the Thames at once. A London Marathon finisher poster captures the route that built to that crossing: 26.2 miles of south and east London converging on a single suspended span, then the long push west to The Mall.

TCS London Marathon at a glance

• World Marathon Major: One of the six Abbott WMM events, alongside Tokyo, Boston, Berlin, Chicago, and New York
• Entry: Ballot-based; one of the hardest race places to secure in the world — typical acceptance rates below 5%
• Field size: Approximately 50,000 runners
• Course profile: Point-to-point, Blackheath to The Mall — largely flat, around 100m total elevation gain
• Race date: Late April, typically the last Sunday of the month

The course

The race starts on Blackheath Common, where three separate start pens — elite, championship, and mass — funnel into one by the time Greenwich comes into view. The early miles through southeast London are quieter than what follows: residential streets, local crowds, the kind of support that feels earned rather than performed. You pass the Cutty Sark around mile 6, the old tea clipper moored at Greenwich pier, and the route begins to feel like it's building toward something.

It is. Tower Bridge appears at mile 12, and crossing it is the defining experience of the London course. The crowd on both approaches is several rows deep; the bridge itself is closed to traffic and open entirely to runners. It is also where the route map splits most clearly — the southbank loop into Canary Wharf and the Isle of Dogs before the course turns back west, past Bermondsey and along the Embankment. That distinctive out-and-back through Docklands is one reason the London route translates so clearly as a custom route map: the Tower Bridge crossing sits at almost exactly the midpoint, giving the shape a natural anchor.

The final miles run west along the Embankment with the Thames on your left and the Houses of Parliament ahead. You pass Big Ben and Westminster, turn onto Birdcage Walk, and then The Mall opens up in front of you — a straight, tree-lined kilometre with Buckingham Palace at the end. The crowd here is the loudest it's been all day.

The London Marathon carries the particular weight of a ballot place — most runners wait years before their name is drawn. makemap turns the GPS trace from that day into a finisher poster with the exact shape of the route: the Blackheath start, the Tower Bridge crossing, the Docklands loop, The Mall finish. The kind of thing worth putting on a wall.