6.1K views · 65 reactions | Tour khám phá du lịch mạo hiểm hang Sơn Đoòng hút khách #QTTV #truyenhinhquangtri #quangtri #khamphadulich #hangsondoong #hutkhach | Truyền hình Quảng Trị | Facebook

Son Doong Cave (Hang Sơn Đoòng) in Vietnam is the largest cave in the world, so vast that it creates its own subterranean world complete with a self-sustaining climate and ecosystem. Geologists estimate the cave formed between 2 to 5 million years ago as river water eroded the surrounding 400-million-year-old limestone. The scale of this natural wonder is truly difficult to grasp: Massive Dimensions: The main passage is large enough to fit an entire New York City block with 40-story skyscrapers.