The coastlines of the Izu-Ogasawara Islands are home to abundant natural beauty, attracting many tourists while also serving as the setting for the fishing industry, the islands’ primary economic sector. Until now, coastal protection facilities within port and fishing harbor areas have been developed based on the fundamental principle of preserving “coastlines rich in nature and characterized by their beauty,” promoting the creation of coastlines that strike a balance between “protection,” “environment,” and “use.”
In recent years, however, due to sea-level rise associated with climate change and the intensification of typhoons, sections of existing coastal protection facilities where the necessary protective functions cannot be guaranteed into the future are becoming apparent. Furthermore, many facilities have been in use for a long time since their construction, and there is a need for planned maintenance, repairs, and improvements based on the results of facility inspections.
In light of these circumstances, and based on the “Basic Plan for Coastal Protection along the Izu-Ogasawara Islands (Revised March 2025),” we have formulated the “Izu-Ogasawara Islands Coastal Protection Facilities Development Plan (Port and Fishing Harbor Coasts)” to ensure the systematic and efficient implementation of projects over the next 10 years targeting port and fishing harbor coasts. We hereby announce this plan.

1. Overview of the Maintenance Plan

1) Planning Period

Fiscal Years 2026–2035

2) Estimated maintenance costs

Approximately 17 billion yen

2. Implementation Details

• 1) Taking into account the effects of climate change, we will raise the elevation of residential areas and prefectural roads in locations where the current height is lower than the height of the seawall that will be required in the future.
• 2) Carry out new construction and improvements at locations where erosion or damage has been confirmed, taking into account the effects of climate change
• 3) Repairs and beach nourishment due to deterioration

3. How to View Materials

You can download it from the Port Authority’s website.

This project is an initiative to promote the “Tokyo 2050 Strategy.”
Strategy 25: Tama and Islands—”Enhance disaster resilience through disaster countermeasures tailored to region-specific challenges.”

Contact: Planning Division, Remote Islands and Ports Department, Port Bureau Phone: 03-5320-5660