A Rugged Island Shaped by Nature
Mugi Oshima rises to approximately 200 m above sea level and features steep slopes that have helped preserve its largely untouched environment. Landing is difficult along most of the coastline, with access generally limited to a landing area on the western side of the island. Its remote setting and dramatic landscape make it an appealing destination for those seeking a glimpse of Japan’s wilder coastal scenery.
Distinctive Rock Formations
Chinpo-iwa Rock
One of the island’s best-known landmarks is Chinpo-iwa, a uniquely shaped rock in a cove on the western coast. Its name refers to its resemblance to the tip of the male anatomy. Local folklore tells of a beautiful princess who took her own life at this location, after which the rock appeared. The legend is associated with the Himegami Festival, a distinctive local event that reflects the area’s traditional beliefs and cultural heritage.
Katsuo no Tataki-iwa Cliff
On the southwestern side of the island stands a striking cliff approximately 100 m high. Named Katsuo no Tataki-iwa in 2024 by Kenichiro Kosaka, the rock face is said to resemble katsuo no tataki, a Japanese dish of lightly seared bonito. Its unusual appearance and dramatic scale make it a notable feature of the island’s rugged coastline.
Small Islands Scattered Across the Surrounding Sea
The waters around Mugi Oshima contain several smaller islands, including Kainagejima, Tsushima, Kozushima, and Tebajima. Together, these islands create a varied coastal landscape of rocky shores, forested slopes, and open sea, offering a sense of the natural richness of southern Tokushima’s coastline.
Rich Forests and Marine Life
Much of Mugi Oshima is covered in dense woodland, where trees such as Japanese bay trees (Machilus thunbergii) and climbing plants such as Shiratama-kazura grow. The surrounding waters are known for their coral communities and diverse marine life. Fish found in the area include grunt and clownfish, creating an attractive underwater environment for divers interested in exploring Japan’s temperate and subtropical marine ecosystems.
A Destination for Diving and Fishing
The clear waters around Mugi Oshima make the island a popular destination for scuba diving. Beneath the surface, divers can explore coral habitats and observe colorful fish in their natural surroundings. The surrounding sea is also well known among anglers for its variety of fish, making the island an appealing destination for those who enjoy fishing in a remote coastal setting.
Important Safety Precautions
Despite its natural appeal, Mugi Oshima requires careful preparation before a visit. Ticks capable of transmitting Japanese spotted fever are present on the island, and fatal cases have been reported in the region. Visitors should take appropriate precautions, including wearing long sleeves and trousers, using tick repellent, and avoiding unnecessary contact with vegetation. After returning, check clothing and skin carefully for ticks, and seek medical attention promptly if a fever or rash develops after a possible tick bite.
Access and Visiting Restrictions
The island can be reached by boat from Mugi Port in Mugi Town, but there is no regular passenger ferry service. Visitors must arrange transportation in advance through a local diving club or boat operator.
Mugi Oshima is privately owned, and entering without permission is prohibited. Anyone wishing to visit must obtain authorization beforehand and follow the instructions of the landowner or local operator. Because the island has a fragile natural environment and limited facilities, visitors should take all rubbish home and avoid disturbing wildlife or vegetation.
Experience the Wild Coast of Tokushima
With its steep green slopes, unusual rock formations, and waters rich in marine life, Mugi Oshima offers a rare opportunity to experience a remote side of Tokushima Prefecture. Whether viewed from the sea, explored underwater on a guided dive, or visited for a fishing trip arranged with a local operator, the island rewards careful planning with a memorable encounter with Japan’s largely untouched coastal nature.