Okutama

Lake Okutama is a reservoir formed by the Ogouchi Dam across the Tama River, built to supply part of Tokyo's drinking water. Several villages were submerged when the dam was completed, a history commemorated today by Ogouchi Shrine on the lakeshore. The lake itself is surrounded on all sides by mountains and is a genuine scenic destination on its own, popular for cherry blossoms in spring and foliage in autumn.

Its best-known feature is the Mugiyama Bridge, a floating pontoon bridge nicknamed the 'Drum Bridge' because its walkway originally rested on steel drum cans, now replaced with engineered floats of a similar design. Crossing it, a walk of around 10 minutes for its roughly 220-meter span, has a distinct sway to it, since the bridge rises and falls with the lake's water level rather than sitting on a fixed foundation. A second, quieter floating bridge, Tozura, crosses another arm of the lake nearby.

Both bridges close periodically during dry spells, high winds, or maintenance work, since a floating structure depends on water level and weather in a way a fixed bridge does not. It is worth checking current conditions with the Okutama Tourism Association or Visitor Center before planning a visit around either bridge specifically. Walking trails around the lake itself range from easy, flat stretches suited to casual walkers to steeper paths further from the water.

The Nippara Limestone Cave is one of the largest limestone caves in the Kanto region, with a total mapped length of about 1,270 meters and 134 meters of height variance inside. A walk through takes roughly 40 to 60 minutes along a lit, developed path past stalactite and stalagmite formations. The temperature inside stays a steady 11 degrees Celsius year-round, a welcome escape from summer heat and a comparatively mild break from winter cold.

The cave sits well outside Okutama Station itself, reached by local bus (about 35 minutes to the Nippara Cave stop, then a 3-minute walk) or, on weekends and holidays, from the Higashi-Nippara stop with a roughly 20-minute walk. As of this page's fact-verification date, admission runs approximately 900 yen for adults and high school students, 700 yen for junior high school students, and 600 yen for elementary school students, with hours of 9:00 AM to 5:00 PM from April through November and 9:00 AM to 4:30 PM from December through March, last entry 30 minutes before closing, and the cave closed for New Year's from December 30 through January 3. These figures are worth confirming directly before a visit, since a single-operator attraction's own prices and hours can change independently of the wider area.

The Okutama Mukashi Michi, or Okutama Old Road, is the area's signature long-distance walk, roughly 10 kilometers connecting Okutama Station to Lake Okutama. The first stretch of about 7 kilometers follows a paved, gently graded road past old stone walls, roadside guardian statues, small waterfalls, and a scattering of tiny mountain villages, easy going for most walkers in ordinary shoes. The final 3 kilometers down to the lake narrow into a steeper, rougher mountain path, a genuine hike rather than a stroll, and proper footwear matters for that last stretch specifically.

Along the way, the trail crosses two suspension bridges, most notably Shidakura Bridge over the Tama River valley, a structure narrow enough that no more than three people are permitted on it at once. The trail is particularly well known for its autumn colors, when the maple and other deciduous trees lining the route turn through red, orange, and gold.

Hatonosu Gorge offers a shorter, separate river-valley walk of an hour or two along the Tama River, with dramatic rock formations and, again, some of the best autumn foliage viewing in the wider area. It works well as a lower-commitment alternative to the full Mukashi Michi trail, or as an addition to a shorter visit.

Shiromaru Lake, a smaller reservoir one stop before Okutama Station, is the easiest place in the area to try kayaking or Canadian canoe rental. The water stays calm regardless of season, no prior paddling experience is needed, and typical rental runs around 3,000 yen for two hours per boat, which can carry up to three people including life jackets and paddles. Further along the Tama River, near Mitake Gorge, whitewater rafting and kayaking operate seasonally, roughly April through October, alongside mountain stream fishing on the Nippara and Otamba rivers, where anglers can barbecue and eat what they catch.

Okutama Onsen Moegi no Yu, a day-trip hot spring facility about a 10-minute walk from Okutama Station, is a natural way to close out a day on the trails. It draws 100 percent natural hot spring water into an indoor bath overlooking the Tama River and surrounding mountains, an open-air bath, and a footbath for visitors who want a shorter soak without a full bathing session.

Mount Mitake is a well-known mountain reached by cable car, topped by the historic Musashi Mitake Shrine and the moss-covered Rock Garden trail, and it is administratively part of neighboring Ome City rather than Okutama Town, even though it sits on the same JR Ome Line and shares a similar mountain character. Many visitors treat a trip to this wider region as covering both places, but each has its own distinct set of attractions worth planning around separately.

This page covers Okutama's own lake, cave, trail network, and river activities. For the full guide to Mount Mitake's hiking trails, its shrine, and its cable car, see the dedicated Mount Mitake guide at /destinations/tokyo/mount-mitake rather than duplicating that detail here.