Known locally as the "miraculous clear stream," Kogawa offers a mysterious experience, almost like walking on glass. Popular activities from spring to summer include canoeing and SUP (stand-up paddleboarding). On clear days, the water is so clear that the boat's shadow is clearly reflected on the riverbed, creating a mysterious floating sensation. This "floating canoe" is also a popular photo spot, a must-take spot for those looking for a once-in-a-lifetime experience. The green trees reflected on the water's surface, the chirping of birds, and the gentle flow of the water... The feeling of being one with nature is an irreplaceable luxury. With a guide, there are plans available for children as young as two (kayaking is for second-graders and above), making it a safe and enjoyable experience for families with young children. Furthermore, from late May to June, the river transforms into a luminous river, with countless fireflies dancing in the air. The Kitagawa Firefly Festival is also held during this time, and the sight of countless lights dancing above the clear stream in the darkness is so beautiful it will leave you speechless.