The loudest sound in recorded history was heard 4,800 km away

When the volcanic island of Krakatoa erupted on 27 August 1883, the blast was heard as far as Rodrigues Island near Mauritius, roughly 4,800 km away, where people mistook it for distant cannon fire. The eruption sent shockwaves around the globe multiple times and tinted sunsets red for months afterward.

— Wikipedia contributors, 1883 eruption of Krakatoa — 27 August 1883