
Guide
Sotobori Park is a unique green space located in Chiyoda and Shinjuku, Tokyo, developed along the remains of the Edo Castle outer moats (specifically the Ushigome, Niimifude, and Ichigaya moats). The park features a long, narrow layout stretching approximately 2km from the vicinity of JR Iidabashi Station to the south of Yotsuya Station. The presence of these ancient moats, which once served as defensive barriers for Edo Castle, provides a rare glimpse into historical Tokyo. Because it is situated near major business districts and universities, the park is a vibrant part of daily life, used by local office workers, students, and commuters for relaxation and transit.
The foundation of this park lies in the "Sotobori" (Outer Moat) of Edo Castle. These moats, which functioned as a critical defense system during the Edo period, have been repurposed into a modern urban park. As part of the designated historical sites of the Edo Castle outer moat, the topography and structure still retain the atmosphere of the era. This creates a striking contrast where historical remnants are seamlessly integrated into the rhythm of modern metropolitan life.

The greatest appeal of the park is the scenic promenade that follows the water's edge, offering changing natural beauty throughout the seasons. In spring, the park is particularly famous for its many cherry blossom trees, creating a stunning tunnel of flowers for visitors to enjoy. Additionally, near the west side of Yotsuya Station, you will find the "Sotobori Park General Ground," which features sports facilities such as a baseball field with night lighting and tennis courts. Although the park is divided into several sections by the JR Chuo Line tracks, each area offers its own unique view and atmosphere.
The most significant seasonal event is the cherry blossom season from March to April. During this time, the park becomes a major destination, with the Chiyoda City even setting up temporary waste disposal stations to accommodate the large crowds of hanami (flower viewing) enthusiasts. Daytime visits in spring are perfect for enjoying the blossoms under the sunlight. Near the sports grounds, the presence of night lighting also allows for evening activities. Regardless of the season, the park is a popular spot for daytime strolls and a refreshing break for local professionals and students.

The park is primarily designed for walking and relaxation. Walking along the riverside promenade allows you to enjoy a tranquil waterfront view right in the heart of the city. For those looking for more active leisure, the area near the General Ground is a hub for sports like baseball and tennis. Observing the daily routine of office workers and students taking a break is also a charming part of the local atmosphere.
The park is conveniently located near major transit hubs, including Iidabashi, Ichigaya, and Yotsuya Stations. From the Iidabashi area, the promenade continues along the embankment, separated from the JR Chuo Line tracks. The surrounding neighborhood is a mix of high-rise office buildings and educational institutions, such as Hosei University, making the park a vital urban oasis.
Comfortable walking shoes are highly recommended for exploring the long promenade. As this is a public space, please be mindful of local etiquette, such as carrying your trash home with you. During the peak cherry blossom season, temporary trash stations may be available, but maintaining cleanliness is essential. Regarding payments and reservations: entry to the park is free and no prior booking is required for general walking or sightseeing. While the park is generally accessible, please note that some sections may have slight unevenness or steps.