The Tomboro of Sanshirojima is a geological marvel located off Dogashima Beach in Nishiizu. It's a natural phenomenon where a sand and gravel bar, known as a tombolo, emerges from the sea during low tide, creating a walkable path to the Sanshiro Islands. These islands, consisting of Denbeijima, Nakanojima, Okinosejima, and Takashima, appear to change in number (three or four) depending on the viewing angle, hence the name Sanshiro (meaning 'three or four'). This temporary land bridge offers a rare opportunity to explore the marine environment between the mainland and the islands.
Visitors consistently praise the unique experience of walking across the tombolo and the beautiful coastal scenery. Many highlight the excitement of seeing the path emerge and the chance to observe marine life in the tidal pools. Reviewers often mention the picturesque views from nearby observation spots, such as Dogashima Park, even when the tombolo is not fully exposed. The sense of adventure and connection with nature are frequently cited as major draws.
For a successful visit, timing is crucial: you must go at low tide to experience the tombolo. Check local tide charts in advance. Visitors strongly recommend wearing appropriate footwear, such as slippers or water shoes, as the path can be very slippery and wet, especially with smaller children. Walking barefoot is not advised. Allow approximately 1-2 hours to walk across, explore the islands briefly, and return. The area can be windy, so consider bringing a light jacket. While the experience is generally positive, some visitors note that the walk can be rough for very young children.
The Tomboro of Sanshirojima is located near Dogashima in Nishiizu-cho. If traveling by bus, disembark at the Dogashima bus stop. From there, it's a short walk to the coast. The area is accessible by car, and some hotels in the vicinity, like Il Azzurri, offer direct views of Sanshiro Island. Parking availability should be checked locally.
The primary complaint revolves around the slippery nature of the tombolo and the importance of proper footwear. To mitigate this, always wear shoes with good grip that you don't mind getting wet. Another potential issue is arriving at high tide, which means the tombolo will be submerged. Always consult tide tables before planning your visit to avoid disappointment.
