Mt. Iwaonupuri is a part of the Niseko-Annupuri volcanic mountains. Although it has an altitude of only 1,116 m, the panoramic view from the summit is famous among hikers. It is also popular for its relatively easy access. As it takes only one hour to the summit, it is recommended for beginners. There is a steep ascending slope just after the starting point, but the rest of the way is almost flat. You can give yourself over to natural wonder and enjoy viewing nameless ponds or a community of cowberry on your way. In about 30 minutes, the summit will come in sight. From there, you can enjoy a panoramic view of Mt. Annupuri in front, the rural landscape of the town of Kucchan to the left below, Weiss Ski Resort and Niseko O-numa Pond. The best season is the fall, when leaves turn blazing red and bright gold to weave out a magnificent landscape. In winter, a lot of skiers come to enjoy ski-trekking.

Ice trees can be seen in winter at the Zao Onsen Ski Area. At that time, the hills of the Ou Mountains are covered with snow. Many ice trees, standing at twice the height of a man, appear like 'shrimp tails'. Skiers on the slopes glide between the ice trees.

Zao is the only place in the world where ice trees can be seen. Certain conditions are necessary for them to appear:
*a place where aiophyllous coniferous trees, such as pines, grow;
*strong seasonal winds of a low-temperature that blow from the same direction so that, as cloud droplets strike the trees' branches and leaves, they freeze immediately, in a process called 'ice coating';
*the snowfall should not be too much nor too little.

From late January to late February, the ice trees are illuminated, producing a fantastic atmosphere.