The Cranberry Island ultra in Maine is 50 one-mile laps, I think.
I ran a 1/2 on a track this year and the race offered a full distance (it was at the Utah Olympic oval). I wouldn't want to do a full - I like having that distance stretched out in front of me - but the 1/2 went by surprisingly fast, and the camaraderie you build with other runners over those many laps is pretty cool.

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maybe she's born with it, maybe it's chlorine
If you're injured and need some sympathy, PM me and I'm very happy to write back.
disclaimer: PhD not MD

The last chance for Boston marathon in Dublin, OH is the same deal around the same time of year. One mile flat loop. I can't imagine a worse race. I'd rather do it IronCowboy style on a treadmill in front of a TV.

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I'm beginning to think that we are much more fucked than I thought.

Sri Chinmoy-esque

A friend is doing the Run for the Ages in Tennessee, which has distances up to 200 miles on a one-mile loop. She's doing the 100 miler. Yeesh.

https://ultrasignup.com/register.aspx?did=31290

A guy in Seattle ran a 400m track... barefoot.... for 24 hours. I forget how many multiple marathons that was.

Another guy in Seattle rode 100 miles on a bike by circling on a trail in a small park.

Yeah..... no. Do not want.

How do they plan to handle the 0.1 and 0.2mi. issues with the race distances?

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

I have a local 1 mile trail that I will run up to 15 miles, but I couldn't imagine running a full marathon on it.

Many years ago I did a 13 mile run on a high school track as "preparation" for my first half. Never, ever will I do that again.

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"Whether you believe you can or you can't, you are right."

I once did 100K of laps around a 1K bicycle loop. Then again, it was in the course of racing 3 criteriums that day ;-)

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http://bikeblather.blogspot.com/

There's a marathon in my area that does the same thing (circularlogicmarathon.com). It's 26 laps around the city park, and the first lap has an extra .2 mile dogleg. But yeah, if you want to do a half marathon, you're out of luck there.

1.5/10 for Seattle. the 1 is a sympathy point.

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What are you people, on dope?

—Mr. Hand

I have seen trail running and mountain bike races that have a similar concept, but usually the loops are a few miles long. It makes the logistics easier. Typically, they are races to see how much you can ride or run in 12 hours or another time period. They are easy to do as teams were people can switch off, or on the long races, people can stop and rest or even get things out of their cars after their loops.

This reminds me of two buddies who were training for their first ultra... it was freezing rain outside... so they did a marathon... as a training run... on... a... treadmill. #rathergetkickedinthenuts

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“What comes into our minds when we think about God is the most important thing about us.” -A.W. Tozer
"The best things in life make you sweaty." -Barbara W.
"I was never great at math, so I had to learn to run faster." -Robbie Sandlin
“Life is like a 10-speed bicycle. Most of us have gears we never use.” Charles Schultz

I did the last chance for Boston marathon in Columbus which is exactly that, 26x1 mile loops. I didn't think it would be too bad since I do a fair amount of running on a 1km track. I was wrong! Imagine walkers, walking the course maybe 5 wide, and you get to weave in and around them on every single lap. If it weren't for the slow lap traffic that wouldn't stay out of the way, I could have handled the boredom of the same loop. But I'd never do it again.