Ritsuunkyō, Canyon in Asago, Japan

Ritsuunkyō is a gorge in Takeda, Wadayama-chō, Asago, cut by the Maruyama River below Mount Asago (756.4 m). It holds the Ōnaru Pond, the Ryūjin Falls and many boulders and waterfalls, and is known for mountain cherries. Four observation decks face the Takeda Castle ruins on Mount Kojō (353 m).

The canyon faces Takeda Castle, a fortress built in 1443 that served as a military stronghold during Japan's Warring States period. This location formed part of the strategic landscape of the mountain region during medieval times.

During autumn mornings, the location presents the unkai phenomenon where Takeda Castle appears to float above clouds, drawing photographers from across Japan.

From JR Takeda Station on the Bantan Line, the parking area is a 10-minute taxi ride or a 45-minute walk. The car park stays open around the clock and asks for a cooperation fee of 300 yen per person aged high school or older. From the car park, the second observation deck is about 10 minutes on foot, the third about 5 minutes, and the first about 40 minutes; Ritsuunkyo Terrace, with the Light Path monument unveiled in April 2022, is one minute from the first deck. Toilets stand beside the car park.

The canyon is nicknamed Tajima-Yoshino for its mountain cherries, and the Ritsuunkyo Cherry Blossom Festival is held each year when they flower. Four observation decks look toward Takeda Castle, and the Ritsuunkyo Terrace, built in September 2021, holds the Light Path viewing monument unveiled on 9 April 2022.