Oshino Hakkai (忍野八海) is a touristy set of eight ponds in Oshino, a small village in the Fuji Five Lake region, located between Lake Kawaguchiko and Lake Yamanakako on the site of a former sixth lake that dried out several hundred years ago. The eight ponds are fed by snow melt from the slopes of nearby Mount Fuji that filters down the mountain through porous layers of lava for over 80 years, resulting in very clear spring water that is revered by the locals.
Next to one pond, visitors can drink the cool water straight from the source. The ponds are quite deep and have interesting freshwater plant life and large fish that make a visit to the ponds almost like visiting an aquarium. Although the ponds have been developed into tourist attractions and can become quite crowded with visitors, they have a pleasant atmosphere as long as you do not expect untouched nature.
You will find many restaurants, souvenir shops and food vendors around the ponds which sell vegetables, sweets, pickles, crafts and other local products. Some operate small outdoor grills to attract shoppers with the alluring smells of roasted sweet potato and toasted rice crackers (osenbei).
A small open air museum, the Hannoki Bayashi Shiryokan, surrounds Oshino Hakkai's largest pond and costs a small admission fee. It contains a traditional thatched roof farmhouse that can be viewed inside and displays various farming tools, household items, samurai armor and weapons.
Roughly every other bus between Kawaguchiko Station and Gotemba (approximately one per hour) makes a small detour via Oshino Hakkai (see timetable). Furthermore, buses from Fujisan Station bound for Uchino and Hirano, the Fujikko tourist buses and the Mount Fuji World Heritage Loop buses also make a stop at Oshino Hakkai once or twice per hour. Get off at the "Oshino Hakkai" bus stop (some buses bound for Uchino and Hirano use the "Oshino Hakkai Iriguchi" bus stop, instead; not to be confused with the more distant "Oshino Iriguchi" bus stop).