Volcanoes are located mainly along tectonic plate boundaries around the world, with the majority found around the Pacific Ocean in the "Ring of Fire." Key regions with high volcanic activity include:

• The Pacific Ring of Fire, which includes countries like the United States (especially Alaska and Hawaii), Japan, Russia (Kamchatka Peninsula and Kuril Islands), Indonesia, Chile, and many Pacific islands.
• Other notable areas are the Mediterranean region (e.g., Mount Etna in Europe), parts of Africa (e.g., Mount Cameroon and Nyiragongo in Congo), and oceanic hotspots like Hawaii.
• Over 75% of Earth's volcanoes are concentrated around the Pacific Ocean basin.
• Volcanoes also exist underwater along mid-ocean ridges spanning about 40,000 miles globally.

Countries with the most volcanoes include the United States, Japan, Russia, Indonesia, and Chile, contributing to clusters of active, dormant, and historic volcanoes across continents and oceanic regions.