Here is a 50-100 word summary of Monbetsu City Oyama (紋別市営大山スキー場): Monbetsu City Oyama is a ski resort located in Monbetsu, Hokkaido, Japan. It has two lifts, a 401m pair lift and a 701m single lift, and offers skiing for both beginners and intermediate skiers. The resort is situated near the town center and the Sea of Okhotsk, and is known for its beautiful ice floes. The resort's opening hours vary depending on the day of the week, with longer hours on weekends and holidays. The resort is easily accessible by car, with a parking lot available on site.