Oyama Masumizukogen (桝水高原スキー場) is a ski resort located in Houki, Tottori Prefecture, Japan. It offers 3 ski trails, a snow park, and a high-speed pair lift. The resort is known for its expansive views of the sea and is open daily, except for Tuesdays. The ski season typically runs from December to April, with night skiing available until 10 PM. The resort has a restaurant and is accessible by car.