What is an ultramarathon, how far and on what terrain?

Ultra running is exploding in popularity around the world, but what actually constitutes ‘ultra’ in an ultramarathon?
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Ultra running is fast becoming a mainstream sport. Once, it was the realm of a few crazy runners, and not the pastime of everyone from your boss to your neighbour. But what actually is an ultramarathon?

Hal Koerner's Field Guide to Ultrarunning: Training for an Ultramarathon, from 50K to 100 Miles and Beyond - Audiobook - Hal Koerner - ISBN 9781977330130 - Storytel

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Everything You Need to Know Before Running Your First Ultramarathon. Nike CA

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What is an ultramarathon, how far and on what terrain?

What Is An Ultra Marathon? Here's Everything You Need To Know – Rockay