Basic Overview
Irohazaka is a famous mountain winding highway located in Nikko City, Tochigi Prefecture, Japan, belonging to the core scenic belt of Oku-Nikko. Its Chinese common translation is Iroha Slope, phonetically close to “Yiluo Qiushan (伊落秋山)” for tourists. The whole route links downtown Nikko with high-altitude scenic spots including Lake Chuzenji and Kegon Falls, rated as one of Japan’s Top 100 Most Beautiful Roads.
Road Structure & Origin
The highway consists of two one-way lanes with a total of 48 sharp hairpin bends, corresponding to the 48 classical characters of the ancient Japanese Iroha syllabary, hence the name “Irohazaka”.
Daiichi Irohazaka (First Slope): Downhill-only passage from Lake Chuzenji to downtown Nikko.
Daini Irohazaka (Second Slope): Uphill-only lane heading toward the highland lake area.
Initially built as an Edo-period pilgrimage path for Nikko shrines and temples, it was reconstructed into a toll highway in the mid-20th century and later opened free to the public. The total length of the whole mountain road system reaches 15.8 km.
Core Scenic Features
Irohazaka earns its top reputation mainly for world-class autumn leaf scenery. From late October to mid-November every year, maples, beech trees and oaks covering the mountain slopes turn into layered crimson, orange and golden yellow. Driving along the continuous bends, visitors travel through a colorful autumn canyon, forming a classic Japanese autumn landscape picture.
The Akechidaira Observation Deck, halfway up the uphill road, is the best viewing platform. Tourists can overlook the zigzag road, valley forests, distant Lake Chuzenji and Kegon Waterfall simultaneously here.
Travel Information
Best Visiting Time: November (autumn leaf peak); spring fresh green scenery is also worth visiting
Admission Fee: Free of charge for road passage
Transport: Self-driving is the mainstream way; public buses run between Nikko Station and Lake Chuzenji
Tips: Severe traffic jams occur on weekends and holidays during maple season; pull over only at designated safe viewing areas for photography
Cultural Value
It is not merely a transportation route but an iconic landscape symbol of Nikko. Combined with Toshogu Shrine, Chuzenji Lake and Kegon Falls, it forms the complete classic Nikko sightseeing loop, attracting numerous driving enthusiasts, landscape photographers and seasonal tourists all year round.
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