Volcano Park and lava rock villages.

Formed by eruptions over 10,000 years ago, this geological park in Hainan centers on a cluster of dormant volcanic cones, lava tunnels, and deep basalt depressions. Visitors can hike to the 222-meter-high rim of the main crater for views over Haikou before descending into the lush, bowl-shaped caldera. What truly sets this landscape apart is how the geology spills into the surrounding countryside. Centuries-old settlements like Rongtang and Sanqing are built entirely from dark basalt. Here, local life has adapted to the porous stone, with ancestral temples, narrow alleys, and houses constructed from volcanic rock, alongside historic rain-catching vats. It is a rare, lived-in volcanic landscape where ancient eruptions still dictate the architecture and rhythm of daily life.