Kotohiki Park is a 48 ha expanse of black pine habitat located in the Ariakehama area facing the Seto Inland Sea. In the middle of the pine forest on a white-sand beach, there is a huge sand picture with the inscription ‘Kan’ei Tshuho’. Kan’ei Tsuho is a currency that was used in the Edo period. The sand picture is 122 m east-to-west, 90 km north-to-south, and has a 345 meter circumference. According to legend, the picture was constructed in one night as part of an effort to welcome the local rulers in 1633. The sand picture area is off-limits, but you can look down on it from the summit observation deck in Kotohiki Park. The nice round shape is very clear from this vantage point.