Japan Wanted a 24-Hour Airport That Wouldn't Disturb Anyone – So It Invested $20 Billion and Built Kansai International Airport "Floating" on the Sea Over 10.68 km² with Over 180 Million m³ of Rock

Japan Wanted a 24-Hour Airport That Wouldn’t Disturb Anyone – So It Invested $20 Billion and Built Kansai International Airport “Floating” on the Sea Over 10.68 km² with Over 180 Million m³ of Rock

Written by Romário Pereira de Carvalho

Published on 21/02/2026 at 08:44

Updated on 21/02/2026 at 08:46

Imagem: Reprodução / Youtube

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Kansai International Airport in Osaka: 10.68 Sq Km Artificial Island Built Since 1987 with Over 180 Million Cubic Meters of Rock, 1,700-Meter Terminal and 20 Billion Investment

Kansai International Airport in Osaka was built entirely on an artificial island of 10.68 sq km initiated in 1987, with over 180 million cubic meters of rock, a $20 billion investment and a 1,700-meter terminal.

Kansai International Airport Born as Solution to Overcrowding and Urban Restrictions

Kansai International Airport was the first on the planet built entirely on an artificial island.

The decision addressed the overcrowding of the old Itami Airport and local residents’ complaints about noise pollution.

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In Japan, expropriations face strong protests, making expansion in urban areas unviable.

Building in the sea allowed for 24-hour operations, away from residential areas, turning the airport into a vital hub for commerce and tourism.

The measure connected the Kansai region to the rest of the world, consolidating the airport as a logistical and strategic pillar for Osaka and surrounding areas.

10.68 Sq Km Artificial Island Required Millions of Cubic Meters of Clay and Over 180 Million Cubic Meters of Rock

The construction of the island began in 1987 in Osaka Bay. The project required the extraction of millions of cubic meters of clay and the installation of sand columns to stabilize the seabed.

On this base, more than 180 million cubic meters of rock were deposited. The scale is considered massive, making the 10.68 sq km island visible from space.

The main terminal, designed by Renzo Piano, is 1,700 meters long, ranking among the largest and most modern passenger terminals in the world.

Structural System Faces Unstable Ground and Sinking with Millimeter Adjustment Solutions

The structural challenge involved unstable ground, sinking, and vibration. To stabilize the clay layer, sand columns and drainage systems were adopted.

To deal with sinking, hydraulic jacks installed in the columns allow for millimeter adjustments of the building’s level. This feature keeps Kansai International Airport level despite settlement.

Special expansion joints protect against earthquakes and winds, reinforcing structural safety in a maritime environment.

Sky Gate Bridge R of 3.7 Km is the Only Access and Vulnerable Point of the Structure

Access to Kansai International Airport occurs exclusively via Sky Gate Bridge R, a two-level bridge with over 3.7 km in length.

The upper level accommodates road vehicles, while the lower level houses the railway line connecting the island to the mainland. The bridge is described as a vital artery for operations.

In 2018, during Typhoon Jebi, a ship was hurled against the structure, isolating thousands of passengers on the island and exposing the risks of operating in extreme maritime environments.

Official Indicators Highlight 10.68 Sq Km Area, Connection to Shinkansen and Intense Movement

Official data from Kansai International Airport and the Visit Japan portal indicate an area of 10.68 sq km of artificial engineering.

Movement is described as one of the most intense in Asia. The complex was designed to withstand typhoons and tidal waves.

Access is directly connected to the Shinkansen bullet train network, reinforcing regional integration and the airport’s role as a gateway to cities such as Kyoto and Nara.

With information from BMC News.

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Japan Wanted a 24-Hour Airport That Wouldn’t Disturb Anyone – So It Invested $20 Billion and Built Kansai International Airport “Floating” on the Sea Over 10.68 km² with Over 180 Million m³ of Rock

Kansai International Airport in Osaka: 10.68 Sq Km Artificial Island Built Since 1987 with Over 180 Million Cubic Meters of Rock, 1,700-Meter Terminal and 20 Billion Investment

Kansai International Airport Born as Solution to Overcrowding and Urban Restrictions

Major Oil, Gas, and Energy Event Will Take Place in Brazil: Macaé Energy Will Gather Petrobras, Equinor, Prio, Among Other Suppliers and Energy Executives for Business, Networking, and Employment Opportunities

10.68 Sq Km Artificial Island Required Millions of Cubic Meters of Clay and Over 180 Million Cubic Meters of Rock

Structural System Faces Unstable Ground and Sinking with Millimeter Adjustment Solutions

Sky Gate Bridge R of 3.7 Km is the Only Access and Vulnerable Point of the Structure

Official Indicators Highlight 10.68 Sq Km Area, Connection to Shinkansen and Intense Movement

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Japan Wanted a 24-Hour Airport That Wouldn’t Disturb Anyone – So It Invested $20 Billion and Built Kansai International Airport “Floating” on the Sea Over 10.68 km² with Over 180 Million m³ of Rock

Kansai International Airport in Osaka: 10.68 Sq Km Artificial Island Built Since 1987 with Over 180 Million Cubic Meters of Rock, 1,700-Meter Terminal and 20 Billion Investment

Kansai International Airport Born as Solution to Overcrowding and Urban Restrictions

Major Oil, Gas, and Energy Event Will Take Place in Brazil: Macaé Energy Will Gather Petrobras, Equinor, Prio, Among Other Suppliers and Energy Executives for Business, Networking, and Employment Opportunities

10.68 Sq Km Artificial Island Required Millions of Cubic Meters of Clay and Over 180 Million Cubic Meters of Rock

Structural System Faces Unstable Ground and Sinking with Millimeter Adjustment Solutions

Sky Gate Bridge R of 3.7 Km is the Only Access and Vulnerable Point of the Structure

Official Indicators Highlight 10.68 Sq Km Area, Connection to Shinkansen and Intense Movement

Where there was only sand and wind at 40 degrees, China built a megacity of 500,000 inhabitants with farms, wineries, and universities in the middle of the desert using melted glacier water from hundreds of kilometers away.

At over 8,800 meters above sea level, the summit of Mount Everest is made up of rocks that originated at the bottom of an ocean about 500 million years ago and were pushed to the highest point on Earth by the collision of tectonic plates.

What seemed like waste has turned into a barrier, and now human hair collected from salons helps retain debris in the water of ancestral channels in Latin America.

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