What's the longest-burning fire in the world?

The oldest known burning fire in the world was likely ignited by lightning at least 5,500 years ago in Australia.

As Smolders, Indonesia Fires Choke the Other Side of the World - The New York Times

Wildfire, Definition & Facts

Maui fires: What to know about Hawaii's deadliest disaster, damage and death toll

Wildfires: How They Form, and Why They're so Dangerous

Wildfires

This Hellish Underground Fire Has Burned for 100 Years

TIL the world's longest burning fire is 6000 years old : r/todayilearned

World's oldest fire has mysteriously been burning for 6,000 years

Centralia, Pennsylvania: The Ghost Town Atop an Inferno

Longest Burning Light Bulb in the World - Weird California