Guide
Iroha-zaka is a section of National Route 120 that connects Umagari in Nikko City, Tochigi Prefecture, to the shores of Lake Chuzenji. Its most striking feature is the series of continuous hairpin curves. The road is named after the traditional Japanese phonetic alphabet, the 'Iroha,' as there were once 48 curves corresponding to the characters. Even today, you can see signs for each curve marked with these traditional characters. The route consists of two distinct sections: the 'Second Iroha-zaka' for ascending the mountain and the 'First Iroha-zaka' for descending, offering a dynamic driving experience that follows the natural contours of the mountain.
While this route once functioned as a toll road, it is now a free public road open to all travelers. As a vital artery leading to the sacred areas of Lake Chuzenji, it has long been a beloved route for travelers seeking the natural beauty of Nikko. The unique system of assigning characters from the 'Iroha' (the traditional Japanese way of ordering the alphabet) to each curve serves as a charming cultural element that adds a sense of history and identity to the drive.
The greatest appeal of Iroha-zaka is the ever-changing scenery as you navigate the curves. The view changes significantly depending on whether you are ascending or descending the mountain. Along the way, there are several rest areas and parking lots designed for travelers to stop, step out of their vehicles, and fully immerse themselves in the surrounding wilderness. A fun way to experience the road is to look for the character signs at each curve. The shifting colors of nature throughout the seasons make every drive a unique and beautiful experience.
Iroha-zaka presents a completely different face depending on the season. In spring, the mountains are covered in vibrant fresh greenery, offering a sense of renewal. The autumn foliage season is arguably the most spectacular time to visit; driving through a tunnel of brilliant red and yellow leaves is an unforgettable experience. However, because the autumn season is extremely popular, the roads can become very crowded. We recommend traveling in the early morning to avoid traffic. Additionally, be aware that the area is prone to fog depending on the weather, which can affect visibility.
The primary way to enjoy this area is via a car or bus. Driving a rental car or your own vehicle is highly popular as it allows you to stop and enjoy the scenery at your own pace. If you prefer public transportation, several bus lines, such as Tobu Bus, operate frequently and provide smooth access from the Nikko Station area. Whether you are driving or riding, the expansive views from your window allow you to experience the grand scale of Nikko's nature with all your senses.
Once you complete the climb up Iroha-zaka, you will arrive at the iconic scenic spots of Nikko, including Lake Chuzenji and Kegon Falls. This road serves as the essential gateway to these landmarks. As you travel from the central Nikko sightseeing area toward the lake, the journey itself becomes a seamless part of your exploration of the natural environment.
Since most visitors travel by car or bus, wear comfortable clothing suitable for movement. Bringing seasonal layers (especially for autumn and winter) is highly recommended. Please note that you may encounter wild Japanese macaques (monkeys) in the area; feeding wildlife is strictly prohibited. When using parking lots, it is helpful to have cash ready for any fees. While there is some English-language signage, please be mindful of standard Japanese traffic rules and etiquette.