Port Island is an artificial island in Kobe Port, located in Chuo Ward, Kobe, Hyogo Prefecture. Often nicknamed “Porai” or “PI,” it is connected to central Kobe by Kobe Ohashi Bridge and the Minatojima Tunnel. Known as one of Japan’s first waterfront cities with fully integrated urban functions, Port Island was the world’s largest artificial island when it was developed in the 1970s. Today, it continues to grow as a diverse urban district featuring commercial facilities, research institutions, entertainment venues, and residential areas.
Port Island combines residential neighborhoods, commercial facilities, and port infrastructure in a single planned urban area. When it was completed in 1981, it attracted worldwide attention as the largest artificial island of its kind. The project was developed under the slogan “Mountains to the Sea,” using earth excavated from the Rokko mountain range to reclaim land in the Seto Inland Sea.
The concept for Port Island emerged in 1963, and construction officially began in 1966. In 1981, the island celebrated its opening with the Kobe Port Island Exposition, popularly known as Portopia ’81. The event attracted far more visitors than expected and became a celebrated example of a successful regional exposition in Japan.
The island’s planning and design were led by architect and urban planner Eisuke Mizutani. Its development incorporated pioneering technologies and approaches that influenced subsequent urban planning projects. In fiscal year 1980, the project received the Ishikawa Award from the City Planning Institute of Japan and the Technology Award from the Japan Society of Civil Engineers. It also received the Zenken Award from the Japan Construction Technology Association in fiscal years 2005 and 2008.
Advanced engineering techniques were used to create stable reclaimed land and develop the island’s neighborhoods. These included sand-drain, preloading, and vibratory compaction methods. Portopia Boulevard, the island’s main street, was selected for the “New 100 Best Streets with Trees in Japan.” Three locations on the island have also been included in Kobe’s selection of 50 scenic viewpoints that capture the city’s distinctive character.
Construction of Port Island’s second development phase, located to the south of the original island, began in 1987. In 1998, this district was designated for development as the Kobe Biomedical Innovation Cluster (KBIC). It has grown into one of Japan’s major medical and life-science research hubs, attracting research institutions and technology companies. The area has also gained recognition for hosting advanced computing facilities associated with supercomputers such as K and Fugaku.
The Great Hanshin-Awaji Earthquake of 1995 caused severe damage to Port Island, including extensive soil liquefaction. Recovery work proceeded rapidly, and the port eventually restored its capacity, with cargo-handling volumes surpassing pre-earthquake levels. The island has continued to evolve through further development and urban renewal.
Port Island has also developed as an important educational district. In 2002, the western part of Port Island was designated an Urban Renaissance Emergency Development Area. Subsequent redevelopment attracted universities and high schools, creating one of Kobe’s prominent campus zones.
In 2016, Port Island became home to Japan’s first school formally established under the compulsory education school system, which integrates elementary and junior high school education. This development further strengthened the island’s educational environment.
During Japan’s postwar period of rapid economic growth, cargo volumes at Kobe Port increased sharply, resulting in persistent congestion as ships waited to enter port facilities. Kobe City expanded its port infrastructure, but additional berths and facilities were still needed. The city therefore planned a new artificial island to accommodate growing maritime trade.
The development plan established five principal goals: building container berths, increasing berths for scheduled shipping services, introducing a dedicated leasing system, promoting highly mechanized cargo handling, and securing land for future urban redevelopment.
Based on these objectives, Port Island was designed as an E-shaped artificial island south of Kobe Port. Reclamation work began in 1966 and took 15 years to complete.
On February 4, 1981, a joint completion ceremony marked the completion of Port Island. The project covered 436 hectares of reclaimed land and cost a total of ¥530 billion. To celebrate the opening of the new urban district, Portopia ’81 was held and recorded the highest attendance of any regional exposition in Japan at the time. Its success helped pave the way for the subsequent boom in regional expositions across the country.
Port Island is home to a major convention district with multipurpose halls, international conference facilities, and exhibition venues. Known as the Kobe Convention Complex, it hosts international meetings, trade fairs, exhibitions, and other large-scale events.
Major facilities include Kobe International Exchange Center, Kobe International Conference Center, Kobe International Exhibition Hall, Kobe Port Island Hall (World Memorial Hall), Portopia Hall, and the Kobe Chamber of Commerce and Industry Building.
The island also offers commercial and business facilities, including Kobe Fashion Town, Xebec Hall, IKEA Kobe, and Tokyo Interior Furniture Kobe Store.
Port Island has a range of attractions for families, tourists, and sports enthusiasts. Highlights include:
Kobe Port Island Sports Center: A comprehensive sports facility with an ice-skating rink and other sporting amenities.
Bando Kobe Science Museum: An interactive science museum where visitors can explore scientific concepts through hands-on exhibits.
UCC Coffee Museum: A museum dedicated to the history and culture of coffee.
Kobe Animal Kingdom: A popular animal and botanical attraction formerly known as Kobe Kachoen, where visitors can encounter a variety of animals and plants.
Minato Ijinkan: A historic Western-style residence relocated from Kitano.
ASICS Sports Museum: An exhibition facility introducing the history and technology of sports equipment.
Other sports facilities include Port Island Golf Club and Saison Port Island Futsal Club.
Port Island is an important center for medical research and healthcare innovation. Its facilities include the KIMEC Center Building, the Institute of Biomedical Research and Innovation (IBRI), the Translational Research Informatics Center (TRI), Kobe Minimally Invasive Cancer Center (KMCC), and the International Medical Development Center (IMDA).
The island also hosts research facilities operated by RIKEN Kobe and the Advanced Institute for Computational Science (AICS), which has been associated with the development and operation of the Fugaku supercomputer. These institutions reinforce Port Island’s role as a hub for scientific research and technological innovation.
Visitors can choose from several hotels on the island, including Kobe Portopia Hotel, one of Kobe’s leading luxury hotels, as well as Hotel Pearl City Kobe and Ariston Hotel Kobe. These accommodations are convenient for visitors attending conferences, exhibitions, or events at the island’s convention facilities.
Despite its modern urban landscape, Port Island offers several places to enjoy open space and greenery. These include Port Island North Park, Port Island Central Park, Port Island South Park, which features the Hope and Dream Baseball Field, Port Island West Park, also known as Port Island Shiosai Park, and Port Island Central Green Park.
The main public transportation link to Port Island is the Port Liner, an automated transit system operated by Kobe New Transit. Important stations include Naka Koen, Minatojima, Shimin Hiroba, and Minami Koen. The line connects the island with central Kobe and provides convenient access to its major facilities.
Bus services also connect Port Island with other parts of Kobe. Routes include services operated by Shinki Bus between Sannomiya and the MOL area, as well as between Kobe Station South Exit and Central Citizen Hospital. Kobe Transportation Promotion has also operated services serving the Port Island campus area. Bus rapid transit (BRT) has been considered as a possible way to ease congestion on the Port Liner.
Port Island is connected to the mainland and neighboring airport island by several bridges and tunnels. Main routes include Kobe Ohashi Bridge, Portopia Bridge, the Kobe Port Minatojima Tunnel, and Kobe Sky Bridge, which links to Kobe Airport Island. The Hanshin Expressway Route 3 Kobe Line and Route 5 Bayshore Line also provide road access to the area.
Port Island brings together commercial facilities, entertainment venues, scientific research institutions, educational campuses, hotels, and green spaces in one distinctive waterfront district. With convenient transportation links and a strong role in business, medicine, and technology, it offers a different perspective on Kobe beyond its historic port and traditional sightseeing areas. Visitors can explore its museums and leisure attractions while discovering the city’s vision for the future.