The Chay River, winding along the western branch of the Ho Chi Minh Trail, carves its way through the heart of Vietnam's Phong Nha–Ke Bang National Park, a UNESCO World Heritage Site in Quang Binh Province. Its emerald-green, serene waters thread between towering limestone rocks and primeval jungle, creating a captivating natural ribbon drawing eco travelers, especially during summer

A hub of river-based adventure

Thanks to the Phong Nha–Ke Bang Tourism Center, the Chay River now offers an array of water-centric thrills: invigorating swims, relaxing kayak rides, and exploratory journeys into the famous Dark Cave. Floating pontoons are anchored across the river, inviting visitors to sit back—or leap into the cool depths from bamboo bridges—for a playful splash
Zip-lining thrills
One standout activity is the zip line, spanning roughly 400m—from a platform high above the river into Dark Cave or the water itself. Visitors soar over the lush valley with breathtaking panoramic views of the river and ancient karst formations

British tourist David Hall, 23, described his experience:
“It was amazing to swim in such emerald green water. Our favorite part was the zipline across the river.”
Summer expansion
As the warm season approaches, the tourism center continues to enhance its offerings, adding new river-based attractions and supporting infrastructure—such as floating huts, additional inflatables like SUP boards and water trampolines—and ensuring safety and quality for visitors

Phong Nha–Ke Bang's Chay River has quickly become a must-visit destination for eco tours and adventure seekers. Whether you're paddling through serene emerald waters, plunging from pontoons, exploring the enigmatic Dark Cave, or soaring thrillingly on a zip line, this vibrant river destination delivers unforgettable experiences amid UNESCO-protected wilderness.