Irohazaka

Irohazaka (いろは坂), also known as Iroha Slope, consists of two winding roads located in Nikko, Tochigi Prefecture, Japan. It is a famous driving route renowned for its series of 48 hairpin bends, each marked with a character from the old Japanese alphabet, “iroha.” The roads connect the lower elevations of Nikko town with the highlands surrounding Lake Chuzenji, offering stunning views of the mountains and forests.

The First Irohazaka, a one-way road, descends from Lake Chuzenji to Nikko, while the Second Irohazaka, also one-way, ascends to the lake. The roads are particularly popular in autumn, when the leaves turn vibrant shades of red, orange, and yellow, painting the surrounding mountains in a breathtaking display.

Besides its scenic beauty, Irohazaka holds historical significance. Built during the Edo period (1603-1868), the roads initially served as a pilgrimage route to the shrines and temples in Nikko. Today, Irohazaka remains a popular destination for tourists seeking to experience the thrill of navigating the winding curves and admire the scenic beauty.

Located midway on the Second Irohazaka, the Akechidaira Observation Deck provides panoramic views of the slopes and surrounding landscape.

Due to high traffic volumes, especially during peak seasons like autumn weekends, private cars may be restricted from using the roads. In such cases, public transportation options like Tobu Railway and Tobu Bus Nikko offer convenient access from Nikko Station or Tobu-Nikko Station to the Lake Chuzenji area.

Getting there

Access by Bus

From JR Nikko Station or Tobu Nikko Station, take a bus bound for Chuzenji Onsen or Yumoto Onsen.

• Travel time: About 35-40 minutes
• Get off at: Akechidaira bus stop
• Cost: 1250 yen one-way

Buses run several times a day. During the autumn foliage season, it’s recommended to take an early morning bus to avoid crowds.

Access by Car

It’s about a 15-minute drive from Kiyotaki IC on the Nikko-Utsunomiya Road.

Important Notes

• The autumn foliage season (mid-October to early November) is extremely crowded. Try to avoid weekends and holidays, and visit as early in the morning as possible.
• While the drive normally takes about 20 minutes, it can take 2-3 hours during peak autumn foliage times.

Nikko Irohazaka Kengamine Observatory

Hours	Open 24 hours
Admission	Free
Address	Chugushi, Nikko, Tochigi 321-1661