Korankei (香嵐渓, Kōrankei) is a valley near Nagoya reputed to be one of the best spots for autumn colours in the Chubu Region. Shaping the valley is the 254 meters tall Mount Iimori, on which Kojakuji Temple stands. In the 17th century, the head priest of Kojakuji planted some maple trees along with the temple approach, prompting many locals to do the same in the area. Today, visitors to Korankei can see the fruits of these past efforts, in the form of excellent autumn scenery that peaks around mid to late November each year.
The best colours tend to appear around the paths along Tomoe River at the western and southern sides of Mount Iimori. Visitors can enjoy lovely sights of maple tree tunnels and autumn colours in combination with views of the river and the few bridges across it. The vermillion Taigetsukyo Bridge is the symbol of Korankei and a great picture-taking spot. https://www.japan-guide.com/e/e3316.html