Iriomote Island Jungle Cruise: Mangrove Rivers and Hidden Waterfalls

Iriomote Island, the second-largest remote island in Okinawa, is a hidden island where about 90 percent is covered in subtropical primeval forest, so full of life that it is called the Galapagos of the East. Experiences that let you feel untouched nature with your whole body, such as a jungle cruise through vast mangrove forests and trekking toward waterfalls deep in the jungle, draw many travelers.

The Nature and Ecosystem of Iriomote

Iriomote Island has an area of about 289 square kilometers, the second-largest in Okinawa after the main island, and about 90 percent of it is covered in subtropical primeval forest. Home to a rich ecosystem where diverse creatures live, including the Iriomote wildcat, a designated Special Natural Monument, it is valuable even by world standards. In recognition of this value, in July 2021 it was registered as a UNESCO World Natural Heritage site under the name Amami-Oshima Island, Tokunoshima Island, Northern part of Okinawa Island, and Iriomote Island.

Nakama River Cruise and Waterfall Tours

The main draw of Iriomote sightseeing is a pleasure-boat cruise up the Nakama River and the Urauchi River. The boat trip through a tunnel of giant mangroves lining both banks is as powerful as wandering into a primeval jungle.

Beyond the cruise wait hidden waterfalls reachable only by canoe or trekking. Majestic falls that appear after passing through the jungle, such as Mariudo Falls and Pinaisara Falls, show an unforgettable landscape.

Practical Travel Notes

• Iriomote Island has no airport, so you cross by ferry from the remote-island terminal in Ishigaki. As a guide, Ohara Port takes about 35 to 40 minutes and Uehara Port about 40 minutes (varies by service)
• The Uehara Port route is prone to cancellation in winter when north winds are strong, in which case it may be switched to a connecting bus via Ohara Port. Check operation status with the ferry company on the day
• Trekking to waterfalls and along rivers is on rough paths and dangerous when water levels rise, so joining a guided tour is standard. Prepare easy-to-walk shoes, insect repellent, rain gear, and water
• Iriomote wildcats may come onto roads at night and early morning, so keep to the speed limit when driving on the island to help prevent accidents
• Certified as a Dark Sky place, spots with few streetlights offer a sky full of stars on clear nights

Best Season and Access

Thanks to the subtropical climate it can be enjoyed year-round, but spring to autumn, when both sea and rivers are comfortable, is especially recommended. Marine activities are also popular. Access is by ferry from the remote-island terminal in Ishigaki, and within the island you move by bus, rental car, or tour. To protect the precious natural environment, touring on a guided eco-tour is reassuring.

📚 Sources

This article draws on tourism guidance from Taketomi Town, guidance from operators of the Nakama and Urauchi river cruises and trekking tours on Iriomote, materials from the Ministry of the Environment and the Forestry Agency on the UNESCO World Natural Heritage Amami-Oshima Island, Tokunoshima Island, the northern part of Okinawa Island, and Iriomote Island, and sailing information from the ferry operators serving the Ishigaki Port ferry terminal. Descriptions of the Iriomote wildcat and the dark-sky reserve follow the Ministry of the Environment and local guidance. Ferry operating status and tour content change with sea conditions, so please confirm details on each operator official sources before visiting.

Visitor Checklist

• Estimated time: Iriomote has no airport; cross by ferry from the Ishigaki Port ferry terminal. Ohara Port is about 35 to 40 minutes and Uehara Port about 40 minutes (varies by sailing).
• Checking sailings: The Uehara route is prone to cancellation in winter north winds and may be switched to a connecting bus via Ohara Port; confirm the day-of status with the ferry company.
• Using tours: Waterfall and river trekking follows rugged paths and is dangerous during high water, so joining a guided tour is the norm.
• Clothing and gear: Prepare comfortable shoes, insect repellent, rain gear, and water.
• Driving and nature: The Iriomote wildcat may come onto roads at night and early morning, so obey the speed limit to prevent accidents. As a dark-sky reserve, clear nights offer a sky full of stars.

Practical Information for Your Visit

Some areas of Iriomote Island are designated as restricted-entry fields (specified natural tourism resources) under Japan's Ecotourism Promotion Act.

• The fields concerned: Five areas - the Hinai River (Pinaisara Falls) / the Nishida River (Sangara Falls) / Mt. Komidake / the headwaters of the Urauchi River (the cross-island trail and Mayagusuku Falls) / Mt. Tedo
• Procedures required: To enter on or after March 1, 2025 (Reiwa 7), you need prior approval from the Mayor of Taketomi Town
• Conditions for approval: Your visit must fall within the daily cap on the number of visitors set for each field; in principle you must be accompanied by a guide approved by the Mayor of Taketomi Town (a registered leading guide) - for Mt. Komidake, the headwaters of the Urauchi River and Mt. Tedo, entry is also possible after taking a course run by the town; and the prescribed administrative fee must be paid
• Fee: 500 yen per person when accompanied by a registered leading guide
• When to apply: Applications are accepted from six months before the date you wish to enter. A provisional application alone is not enough; a formal application by a guide operator or similar is also required
• Access: Iriomote Island has no airport. From Ishigaki Port Ferry Terminal, high-speed boats take about 35 to 40 minutes to Ohara Port and about 40 to 60 minutes to Uehara Port

Note: Entering without approval may be punishable under the law. Avoid going in on your own and always consult an operator with registered leading guides. Note: Please check the official guidance for the daily cap on visitor numbers for each field before you set out. Note: Trekking along the rivers is extremely dangerous when water levels rise, and the island is also home to dangerous creatures such as the Sakishima habu pit viper. Please do not go alone.

(Sources: Taketomi Town official website / official website of the Taketomi Town Iriomote Island Ecotourism Promotion Council / Taketomi Town Tourism Association official website)