Nikkō (日光市, Nikkō-shi^?) is a city located in , in the northern Kantō region of Japan. As of May 2015, the city had an estimated population of 84,197 and a population density of 58.1 persons per km². Its total area was 1,449.83 km². it is a popular destination for Japanese and international tourists. Attractions include the mausoleum of shogun Tokugawa Ieyasu (Nikkō Tōshō-gū) and that of his grandson Iemitsu (Iemitsu-byō Taiyū-in), and the Futarasan Shrine, which dates to the year 767. There are also many famous hot springs (onsen) in the area. Elevations range from 200 to 2,000 m. The Japanese saying "Never say 'kekkō' until you've seen Nikkō"—kekkō meaning beautiful, magnificent or "I am satisfied"—is a reflection of the beauty and sites in Nikkō.

Nikkō covers a large area (1,449.83 km²) of rural northwestern Tochigi approximately 140 km north of Tokyo and 35 km west of , the capital of . It is the third-largest city (by area) in Japan, behind Takayama and Hamamatsu.

Both the Watarase River and the Kinugawa River pass through the city. Lake Chūzenji and the Kegon Falls lie in Nikkō, as does the Nikko Botanical Garden. The city's many mountains and waterfalls have made it an important source of hydroelectric power. The area has also been used for mining copper, aluminum and concrete.

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