The sea around Kashiwa Island, which is connected to the town of Otsuki by a bridge, and around the inhabited islands of Okinoshima and Uguru off the city of Sukumo is relatively warm thanks to the Kuroshio Current that flows into the area. Over 1,000 kinds of fish inhabit the sea and there is a large coral reef colony in the area. A unique culture and lifestyle have taken root on these islands blessed with a mild climate. The islands boast beautiful landscapes, such as stone walls to protect houses from sea breezes and seasonal winds as well as terraced fields on slopes. The islands are also known as spots for marine sports including surf fishing and scuba diving.