Primeval flower garden is where flowers flourish naturally without any human treatment. Hokkaido is exactly the paradise of primeval flower garden. A typical example is "Koshimizu primeval flower garden" in Doto area. About 40 kinds of wild flowers grow in its grassland, which is a part of the quasi-national park. Rugosa roses appearing from June to August are very beautiful, and they captivate those who see the flowers with the blue sky above the Sea of Okhotsk at the back.