Mariyudu Falls is one of the most impressive waterfalls on Iriomote Island, located along the middle reaches of the Urauchi River. The powerful two-tiered waterfall is approximately 20 meters wide and 16 meters high, surrounded by the lush subtropical forests for which Iriomote Island is famous.
The waterfall is included among the 100 Best Waterfalls in Japan, a selection that recognizes some of the country’s most remarkable waterfalls. The surrounding area is covered by a natural recreational forest, creating a spectacular landscape filled with dense greenery and tree ferns.
The name “Mariyudu” comes from a Yaeyama regional expression meaning “a round pool” or “a round eddy.” The name originally referred to the waterfall’s plunge pool before eventually becoming established as the name of the waterfall itself.
The large plunge pool is oval-shaped, measuring approximately 130 meters along its longer axis and 80 meters along its shorter axis. Its distinctive shape and tranquil appearance contrast beautifully with the powerful water cascading down the two levels of the falls.
The Urauchi River is remarkable not only for its scenery but also for its rich aquatic ecosystem. A long stretch of brackish water extends upstream to the area directly below the waterfall, providing a habitat for more than 400 species of fish.
Several rare species found here are particularly associated with Iriomote Island, including Urauchi snapper, Shimizu striped grunt, striped grunt, false striped grunt, and kawabora. The plunge pool itself is also home to aquatic creatures such as eels, giant freshwater prawns, and other freshwater fish.
For nature lovers, the waterfall therefore offers more than a beautiful view. The surrounding river and forest provide an opportunity to experience the remarkable biodiversity of Iriomote Island.
Reaching Mariyudu Falls is part of the adventure. Visitors first travel by boat along the Urauchi River to Gunkan-iwa, a landmark in the upper reaches of the river. From there, the trail continues on foot for approximately 1.5 kilometers, taking around 30 minutes.
The trail passes through dense subtropical vegetation, allowing visitors to experience the atmosphere of Iriomote’s pristine forest along the way. A viewpoint on the walking route provides an opportunity to admire the waterfall from above and appreciate the surrounding wilderness.
The area around Mariyudu Falls is characterized by lush subtropical forest, including abundant ferns and Yaeyama palm trees. The dense vegetation and diverse wildlife create an atmosphere that feels far removed from urban life.
Visitors may encounter a wide variety of plants and animals as they make their way through the forest. The journey itself is an important part of the experience, offering a close look at the unique ecosystem that has developed on Iriomote Island.
The Urauchi River and the surrounding wilderness also provide opportunities for kayaking, canoeing, and trekking. Guided river tours are particularly popular because they allow visitors to travel upstream while enjoying the forest and river scenery before continuing on foot toward the waterfall.
For international visitors unfamiliar with the island’s terrain, joining a local guided tour can also be a rewarding way to learn about the area’s plants, wildlife, river ecosystem, and conservation efforts while traveling safely through the wilderness.
Mariyudu Falls is part of the exceptionally valuable natural environment of Iriomote Island. The island is home to numerous rare and endemic species, making responsible tourism essential for preserving its forests, rivers, and wildlife for future generations.
Visitors are encouraged to respect the surrounding environment, take all rubbish with them, avoid damaging plants and wildlife, and follow the guidance of local tour operators. Choosing an environmentally responsible guided tour can help visitors enjoy the waterfall while supporting sustainable tourism and conservation.
The trail to Mariyudu Falls passes through a natural forest environment, where some sections may be slippery or steep. Sturdy walking or hiking shoes and appropriate outdoor clothing are recommended.
During the summer, temperatures and humidity can be high, so bringing sufficient drinking water and staying properly hydrated is especially important. Visitors should also allow enough time to travel safely rather than rushing through the forest.
Mariyudu Falls combines the power of a magnificent two-tiered waterfall with the extraordinary biodiversity of the Urauchi River and Iriomote’s subtropical forest. Although reaching the falls requires a boat ride and a walk through the wilderness, the journey makes the final view all the more rewarding.
For travelers seeking an authentic encounter with the untamed natural beauty of Iriomote Island, Mariyudu Falls offers an unforgettable experience where rainforest, river, wildlife, and cascading water come together in one spectacular landscape.