The Mysterious Beauty of Ueuwo Falls
Ueuwo Falls is a two-tiered waterfall with a total drop of approximately 18 meters. The waterfall is hidden at the end of a narrow passage surrounded by steep rock walls, creating a dramatic and almost otherworldly atmosphere.
As the water rushes down the rock face into the stream below, the surrounding cliffs and moss-covered stones give the area the appearance of a natural cave or secluded canyon. The scenery has even been compared to a “dinosaur’s nest” because of its mysterious and primitive atmosphere.
Several smaller waterfalls can also be found nearby, creating a remarkable concentration of cascades and streams. Together, they form what could be described as a “feast of waterfalls”, where visitors can appreciate the raw beauty of the mountain environment.
The Blue Pool of Hario Falls
Hario Falls is approximately 20 meters high and spreads broadly across the rock face. One of its most attractive features is the beautifully clear, blue-tinted pool at the base of the waterfall.
The surrounding rocks are also notable for the presence of benimadara, a reddish aquatic organism associated with clean, flowing streams. The reddish-brown colors on the rocks contrast beautifully with the clear water, creating a striking and almost dreamlike landscape.
The scenery changes with the seasons. In spring, Japanese camellias add touches of color to the forest, while in autumn, the surrounding trees turn brilliant shades of red, orange, and yellow.
Visiting Hario Falls together with Ueuwo Falls provides a wonderful opportunity to experience the rich natural environment of the upper Kozagawa River and discover a quieter side of the Kii Peninsula.
A Trail for Nature and Adventure
The journey to the waterfalls is an important part of the experience. From the Otō Bridge trailhead, the route follows mountain paths and sections alongside the stream. The combination of dense forest, rushing water, and rugged rocks creates the feeling of a genuine wilderness adventure.
Unlike easily accessible tourist waterfalls, these falls require visitors to be prepared for stream crossings and slippery rocks. The trail can become particularly difficult when the water level rises, so conditions should always be checked before setting out.
Safety Tips for Exploring the Waterfalls
Because the route includes areas where visitors may need to cross streams or walk over wet rocks, appropriate footwear and outdoor equipment are strongly recommended. Waders, stream shoes, or waterproof footwear with good grip can make the journey safer and more comfortable.
During warmer months, visitors should also be aware of yamabiru leeches, Japanese pit vipers, ticks, and other wildlife. Wearing long sleeves and long trousers is recommended, particularly when walking through dense vegetation.
Mobile phone reception may be limited in some parts of the trail. Visitors should therefore prepare in advance, let someone know their plans, and carry everything they may need for the walk.
Do not attempt the route when the river level is high or weather conditions are unsafe. Mountain streams can rise quickly after heavy rain, making crossings considerably more dangerous.
Estimated Walking Times
Otō Bridge trailhead to Ueuwo Falls: approximately 30–40 minutes.
Ueuwo Falls to Hario Falls: approximately 5 minutes.
Hario Falls to the trailhead: approximately 30–40 minutes.
These times are approximate and may vary depending on trail conditions, water levels, weather, and individual walking pace.
Access to Ueuwo Falls and Hario Falls
Location: Matsune, Kozagawa Town, Higashimuro District, Wakayama Prefecture, near Otō Bridge.
Access: From JR Kii-Katsuura Line’s Kōza Station, it takes approximately 70 minutes by car to reach the area around the trailhead.
Discover the Hidden Nature of Kozagawa
Ueuwo Falls and Hario Falls are ideal destinations for travelers seeking the hidden natural beauty of Kozagawa Town. Their dramatic rock formations, crystal-clear mountain streams, moss-covered cliffs, and seasonal vegetation create scenery that feels far removed from the more developed tourist destinations of Japan.
The combination of the mysterious Ueuwo Falls and the beautiful blue pool of Hario Falls makes this a rewarding destination for hikers, photographers, and nature lovers.
For those prepared for a little adventure, a visit to these secluded waterfalls offers a memorable way to experience the wild and peaceful landscape of the Kii Peninsula.