Fujimoto is designing the 60,000-square-metre structure to encircle the site of the upcoming World Expo, which will be located on the artificial island Yumeshima in Osaka Bay.
Led by Bureau International des Expositions (BIE), Expo 2025 Osaka will be held for six months in 2025, following its opening on 13 April.
Fujimoto has designed the wooden ring as a contemporary interpretation of traditional Japanese timber construction, such as that used to construct the Kiyomizu-dera temple in Kyoto.
It will have a diameter of 700 metres and a circumference of two kilometres, which will form the main circulation route for the masterplan.
While incorporating walkways, the structure will double as a shelter from rain and sun, as well as a rooftop observation deck with seasonal landscaping.
On the ground inside the wooden circle, the Expo 2025 Osaka site will be scattered with pavilions designed by architects for participating nations.
These will be divided across three zones, named Pavilion World, Water World and Green World, alongside a series of plazas to hold events.
The first Expo 2025 Osaka pavilion to be revealed on Dezeen is one designed by Shigeru Ban, recently shared in exclusive images.
The undulating pavilion will be built from paper tubes, bamboo and carbon-fibre-reinforced plastic.
The visuals are courtesy of Sou Fujimoto Architects.