In Tsuchizaki, the iron covers for utility holes have the engraving of the Hikiyama event and Kitamae Ships. The Hikiyama event is the annual event of Tsuchizaki Shinmei Shrine, also known as Tsuchizaki Port Festival. Every year on July 20 and 21, Hikiyama floats go around in the town with the representation of historic scenes with large dolls and mark the summer in Akita. Kitamae Ships navigated through the rough waves of the Sea of Japan and connected the towns of the coasts. Kitamae Ships acted as a sort of trade companies in constant movement and supported the Japanese commercial activities of those days, with which the port of Akita prospered from the 17th to 19th century. The Hikiyama event was designated an important intangible cultural property by the State and also as an intangible cultural property of humanity by UNESCO. The Kitamae Ships are designated as a Japan heritage by the National Agency for Cultural Affairs. These iron covers for utility holes have been used in the Tsuchizaki Port area since 2018.