Ryu Spa Resort Kucha Pack - deep cleansing mask with sea mud and seaweed extracts, 120 g.Brand description. Ryu Spa is a Japanese brand inspired by the natural wealth of Okinawa. Its formulas use local plant extracts and marine components that gently care for skin and restore its natural strength and radiance. The composition contains purest deep sea water, extracted from a depth of 612 meters off the coast of Kumejima Island. This water slowly circulated in the depths of the Earth for more than 2000 years, maintaining exceptional purity