No.1 in Japan.

With a history of more than 400 years, the shipping industry in the Ieshima region has prospered into one of the largest industries in the region by making use of the excellent, natural harbor that has been created out of the terrain.
Many dykes exist on the islands and at its peak, the industry produced 13 million cubic meters of stone a year.
Even now, the output shows no signs of slowing down. The number of Gatt ships used for transporting stones in Ieshima is also the largest in the country and the region is fully equipped with the relevant facilities for outfitting these ships.
In recent years, Ieshima has contributed to the construction of the Kobe Airport, Kansai International Airport, Chubu Airport, Haneda Airport and also to the reconstruction effort for the Great Hanshin-Awaji Earthquake.
Being able to assist in such national projects is a testimony of the pivotal role that it plays in marine civil engineering and construction materials, where its strengths can be said to be unrivalled in Japan.