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A little further along the trail, we come to an 18-metre high mud volcano. Instead of lava, hot mud erupts from it. It hardens and then every six weeks ... explodes over a 5-metre diameter! Thankfully, this always happens at night, so the piping hot mud poses no danger to visitors.

• VIOLENT BUT REGULAR
• HEALING PAST HEROES
• LOOK, TOUCH BUT DON'T BATH
• BEYOND THE BOILING POINT
• HOLD YOUR NOSE AND RELAX!
• EXTREME GEOGRAPHY
• DON'T DIVE IN!