Discover a refreshing natural oasis perfect for swimming and relaxation at the Mooc Spring Eco-trail (Suối Nước Moọc), a popular eco-tourism site within the Phong Nha-Ke Bang National Park area. This hidden gem offers a different kind of water-based activity compared to the cave rivers, centred around a stunning natural spring where cool, turquoise water emerges from the base of the limestone mountains. It's a beautiful spot to cool off, especially on hot days.

The site features a network of bamboo walkways and bridges winding through the lush streamside forest and over the crystal-clear spring waters. Visitors can relax on designated platforms, swim in the incredibly clear and cool designated swimming areas, or engage in activities like kayaking on the stream or trying out rope bridges and swings for a bit of gentle adventure. The vibrant blue colour of the water against the green forest backdrop is incredibly picturesque.

While Mooc Spring can get busy, especially during weekends or holidays (as of April 2025), it offers a fun and accessible nature experience suitable for families and those looking for a relaxing break combined with some light activity. An entrance fee applies, and food/drinks are available on site. It’s a great alternative or addition to cave tours, providing a chance to simply enjoy the beautiful surface-level water features and forest environment of the Phong Nha region.