The mountains and seas of Boryeong are the treasure trove of resources, and local specialties found only in this region are diverse and abundant. In the deep mountains, there is a soil that is said to be superior to that of China, and it produces high-quality inkstones and stone. In particular, the stone such as the tombstone of Ungcheon is recognized as the best stone not only in Korea, but also in Japan and Southeast Asia. The stone produced in Ungcheon is used as a material for various inscriptions and tombstones because of its black, glossy, and excellent material like crow's fur. The stone that is collected and ground in black stands out as time goes by, and when it is carved, white appears. In particular, the stone collected from the Seongju Mountain area is a special product of Boryeong, which has a reputation for being of the best quality in Korea. In addition to the stone, the blue stone that has a blue color and the sad light that is mainly used for religious gifts are also famous in Boryeong.