Guida
The Ooka River is a second-class river that flows through Yokohama, Kanagawa Prefecture, eventually emptying into Yokohama Port. In its upper reaches, the Sasage area, it is affectionately known as the 'Sasage River.' The area holds a rich history, once featuring an inlet known as 'Makita Bay,' and today serves as a vital waterfront space within the urban landscape. The well-maintained promenade along the riverbank offers a peaceful escape from the city's hustle and bustle, allowing visitors to enjoy serene waterfront views.
The history of the Ooka River is profound. Long ago, a large inlet called 'Makita Bay' existed in this area. During the Sengoku period, the Kira clan, based at Makita Castle, controlled this region, and the area played a significant role in maritime-related activities. Historical records also suggest that during the reconstruction of Tsurugaoka Hachiman-gu Shrine in the Muromachi period, this waterway was used to transport timber. The presence of timber wholesalers around the river today serves as a living testament to its history of water transport. Since the mid-17th century, land reclamation has gradually transformed the landscape into its current form.
The Ooka River area offers unique encounters with natural phenomena. For instance, in October 2024, a phenomenon where the water surface glowed due to the proliferation of noctiluca (bioluminescent plankton) was observed. In the past, the appearance of the wild bearded seal 'Tama-chan' in 2002 also drew significant public attention. This makes the area a place where one might encounter unexpected wildlife or natural wonders even within an urban setting. Additionally, various bridges such as Aoki Bridge, Kubo Bridge, and Okubo Bridge offer different vantage points to admire the riverside scenery.
The Ooka River displays different expressions depending on the season and time of day. During bright daylight hours, the area is ideal for a stroll along the well-maintained paths, allowing you to observe the movement of the water and the surrounding cityscape. At night, the scenery changes beautifully as city lights reflect on the water, and under certain conditions, the glowing phenomenon of bioluminescent organisms can be a striking sight. Depending on the season, you can also enjoy the changing vegetation and the shifting river environment.
Visitors can easily connect with the water at the Ooka River Promenade. The primary activities include walking along the developed paths and enjoying the views from the various bridges. Given its historical background, you can also reflect on the history of water transport while observing the local scenery, such as the traditional timber wholesalers. It functions as a wonderful space for urban nature observation.
The area surrounding the Ooka River is integrated with Yokohama's urban functions. The landscape transitions from the Sasage district upstream, through the Sakuragicho and Minato Mirai areas in the midstream, to the Negishi area downstream. The Sakuragicho and Minato Mirai districts, in particular, offer a stunning fusion of modern architecture and river scenery. Numerous bridges span the river, each providing a unique perspective of the area.
The Ooka River Promenade is an open public space, so no special preparation is required, though comfortable walking shoes are highly recommended for your stroll.