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Tsukumi City is known as one of the best limestone producing areas in Japan.

It still boasts one of the largest production volumes in Japan (about ２５ million tons per year), and is said to have an additional ４ billion tons of limestone.

Ancient coral reefs and shellfish have accumulated on the seabed for hundreds of millions of years, and the mountains that have risen due to large crustal movements are limestone mountains.This blessing from the earth was discovered in the Edo period, and mining began.Since then, it has developed as a core industry of Tsukumi.With the opening of the Nippou Main Line between Usuki and Saiki in Taisho ５, production has increased dramatically, which has greatly contributed to the development of modern Japan.

In particular, taking advantage of the proximity of the shore to the mining site, the mined limestone can be transported by belt conveyor to the cement factories on the coast.In addition, because the coastal area becomes deeper than the terrain peculiar to the Rias coast, it is possible for large vessels to enter the port, and the city's large limestone industry, which represents Japan, has developed in this area.

The limestone industry in Tsukumi City has been deeply involved in the lives of citizens so that the city can be named Cement Town.