The most important information about the London Marathon route is that it’s flat. It’s a great route for PB seekers and you can tailor your marathon training around a flat race without the fear of a climb or two knocking you off your rhythm on the day.
Before we dive into more detail, here’s a helpful bit of extra info on the route every runner should know. During the race you’ll notice blue lines on the road. These mark the fastest route and sticking to them throughout will mean you run the exact marathon distance. However, owing to the huge number of runners you’ll encounter, this is impossible for all but the fastest elites, and all the unavoidable weaving and running wide at corners means you’ll probably run slightly more than 26.2 miles/42.2km, so don’t get angry at your running watch if this is the case.
One other thing to note is that the London Marathon provides both mile and kilometre markers along the route, so you can race using whichever measurement you prefer and use the markers to help judge your pacing.
We’ll come to the full route in a moment, but first here are key questions answered. And if you’re a spectator looking for advice on where to stand, these are the best places to watch the London Marathon.
Where does the London Marathon start?
The London Marathon starts in Greenwich Park in Blackheath. There are three different start zones in or by the park: red, green, and blue.
Where does the London Marathon finish?
The London Marathon finishes on The Mall, a stretch that runs from Whitehall to Buckingham Palace, where a huge crowd always gathers to roar the runners home.
Is there water on the London Marathon course?
Yes. There are water stations every two miles on the course with a line of people handing out plastic bottles of Buxton water. Bottles are easier to drink from when running than paper cups, but that’s a lot of potential plastic waste. To mitigate that, each bottle is made from recycled plastic and organisers aim to recycle every bottle. In order to do that, the bottle must be empty, so runners are asked to drink, drain any remaining liquid and then drop the bottle in dedicated bags that will line the route. Don’t drop them on the floor as they become a trip hazard. The London Marathon also sells a bottle belt, designed to accommodate the bottles handed out on the course. However, if you have not trained with one do not strap one on to use in the race – the risk of chafing is too great.
Lucozade Sport, one of the best sports drinks, is available in cups at miles 9, 15, 21 and 23.
Is the London Marathon a flat course?
As with most of the big-city marathons, the London Marathon route is designed to be as close to pancake-flat as possible. In fact, the most notable changes in elevation on the course actually run downhill. (More info on those below.) We’ve run the race four times with different watches and the recorded total elevation gain has been between 119m and 138m, which really is not a lot over the course of a marathon. There’s also no single long climb to worry about – just a few small bumps along the way.
Where can I get a GPX file of the route?
You can easily find GPX files for the London Marathon online, but remember that the race has three different starts and only after around three miles do the routes converge. The Good Run Guide offers the route from the Red Start (opens in new tab), but your best bet might be searching Strava for a runner’s activity from the 2021 event and downloading that. For starters, here’s Coach senior writer Nick Harris-Fry’s 2021 run from the Blue Start (opens in new tab).
The London Marathon Route
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The Start: Depending on the colour marked on your race number, you’ll begin from the Red, Yellow, Green or Blue start. These keep runners separate for the first few kilometres, before everyone merges together.
Kilometres 1-3: Runners head east from the start in Greenwich for the first 3km, where the aim is just to avoid going too quick and/or getting tripped up in the swarm. Stay calm and don’t worry if you feel like you’re losing a tiny bit of time in the mêlée – better to do that than knacker yourself out weaving past people.
Kilometres 4-7: The Green and Blue runners join the Red and Yellow route at around kilometre four, and although they’re kept separate for a while eventually everyone merges, so if you’ve just escaped a crowd from your start wave, expect to be part of another. The good news here is that this section is downhill, sometimes considerably so. Don’t be alarmed to find you’re running five seconds per kilometre faster than your planned pace here – you’ll make up some time from the crowded first few kilometers by just easing down the hills.
Kilometres 8-11: The crowds of supporters really press in on the runners at some points of this section, which makes it easy to high-five people but also means the route can be a little narrow. Just after 10K you’ll reach the Cutty Sark, one of the best-supported points on the whole course. Revel in the crowd and the knowledge that you’ve completed the first quarter of the marathon.
Kilometres 12-19: There’s not a lot going on here to be honest. The crowds are still great, but the route is pretty bland as you wind around Rotherhithe and on towards Tower Bridge. Settle into your pace after the excitement of the Cutty Sark – you should be feeling strong during this section.
Kilometres 20-22: Get ready for a whirlwind of emotions. First there’s the joyous experience of going over Tower Bridge. Then there’s the slight downer of turning right after the bridge at a point where you can probably see the fastest runners coming back the other way on their way to the finish. And then you hit halfway and all the joy comes back. With runners on both sides of the roads, and supporters on both sides as well, this is one of the loudest and most inspiring sections of the race. Headphones out.
Kilometres 22-34: Headphones back in, this tends to be the section where it starts to hurt. Although the Isle of Dogs and Canary Wharf are no longer as lacking in supporters as they used to be, it’s still the least exciting part of the course and as you pass the 32km/20-mile mark you’ll probably be reaching the limits of your training runs. The route winds around Canary Wharf a bit and you’ll have to watch out for runners starting to slow down as they hit the wall. Not you though – you’re killing it.
Kilometres 35-37: As you pass the hordes of supporters around Shadwell again, enjoy the boost of knowing you’re in the home straight now. Whip off the headphones and gain as much energy as you can from the crowd.
Kilometres 37-41: Just 5K to go. That’s a parkrun – you can do that. And this is the most picturesque part of the race, with landmarks aplenty to look out for as you run along Embankment. Before that, however, you run through the Blackfriars Underpass. This is a rare moment where the crowd disappears, which is a bit of a relief if truth be told, and allows you to gather yourself a little before the last few kilometres. The other thing to know about the Underpass is that some runners will use the relative privacy of the tunnel to relieve themselves, or have a little cry, or throw up. Or all three.
Kilometres 41-42.2: Once you turn off the Embankment on to Birdcage Walk you’re unbelievably close to the end. Buckingham Palace is ahead of you, but you have to endure a long slog of a straight to get there so we recommend keeping your head down to avoid the despair when you feel that it doesn’t seem to be getting any closer. Then you suddenly reach it, turn the corner on to the Mall, and the finish line is right there. Congratulations, you’re a London Marathon finisher!