The Akan National Park, in eastern Hokkaido, extends around two lakes, Kutcharo, Akan and Mashu. On either side of Lake Akan are the volcanoes Me-Akan and O-Akan. Much of the park is covered by sub-Arctic primeval forests and is pretty in the fall with its brilliant colored foliage.
In the western part of the National Park lies Lake Akan (alt 1,375ft/ 419m), which has a circumference of 14mi/ 22.5 km and a maximum depth of 118ft/ 36m. The lake is noted for its abundance of fish (trout, salmon) and for a waterweed known as the marimo, which can reach a diameter of 6in/ 15cm. Normally grown on the bottom, the plants rise to the surface when the sun shines, giving the lake a shimmering green color. The marimo, which
is found also in Lake Yamanaka and Lake Sakyo is a statutorily protected species. On the south side of the lake rises Me-Akan (4,931ft/ 1,503m), on the east side O-Akan (4,498ft/ 1,371m) - one volcanoes which form a magnificent backdrop to the lake with its lots of tiny islands.
On the south side of the lake is the health resort of Akan-kohan-onsen, a junction for the various bus services, which run through the park. From here Me-Akan can be climbed (7mi/ 11.5km to the summit). The view from the summit takes in the Sea of Okhotsk, the Pacific and the Tokachi and Nemuro plains. From Akan-kohan-onsen the Akan Traverse Road leads to the O-Akan-onsen, beginning point for the ascent of the extinct volcano of O-Akan (7mi/ 11km). The road continues east of Teshikaga, passing the viewpoints of Sogukudai (view of Me-Akan and O-Akan) and Sokodai (view of the tiny lakes of Penketo and Panketo).
Steep rock faces a rising to 650ft/ 200m and dense forests make the shores of the crater lake, Lake Mashu (circumference 12 1/2mi/ 20km, depth 696ft/ 212m) inaccessible but there is a superb view of the lake from the outlook terrace high above its shores. Lake Mashu is claimed to be the clearest lake in the world, with visibility reaching down to over 130ft/ 40m. On the east side of the lake rises Mount Kamui-Nupuri (2,815ft/ 858m) and on the west side the still-active volcano of Io (1,673ft/ 510m) with its numerous solfataras (vents emitting vapor). The best beginning point for a trip to the foot of the volcano is the romantically situated health resort of Kawayu-onsen.
From here it is 1mi/ 1.5km to the base of the volcano, where sulphurous vapors emerge from numerous vents, coloring the rocks yellowish green with their deposits.
Notthwest of Kawayu-onsen they find the largest lake in the Akan National Park, Lake Kutcharo (alt 397ft/ 121m, area 30sq.mi/ 77.5sq.km, depth 395ft/ 120m). In the midst of the lake is the wooded island of Tomoshiri, on the south side is the resort of Wakoto-onsen, with subterranean hot springs warming the waters of the lake and the sand on its shores (camp sites). Here, , is the source of the River Kushiro, which flows south. There is a fine views of the lake from the Bihoro Pass (1,723ft/ 525m) which carries the road from Teshikaga to Bihoro and Abashiri.
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