How big is the O2 Arena inside?
Posted on Aug 26, 2025 / Travel
The main arena can seat up to 20,000 people, which makes it one of the biggest indoor venues in Europe. Depending on the event, they change the seating layout so smaller shows still feel cozy. The acoustics are designed to work well for both concerts and sports, so you don’t get that messy echo you sometimes hear in big stadiums. Even with a sold-out crowd, the design makes it feel surprisingly comfortable. It’s massive but still feels organized when you’re inside.
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