Enko Festival in the Ushiro River Basin, Nankoku City

Enko Festival Along the Ushirokawa River in Nankoku City

In the lush rice paddies of Nankoku City, Kochi Prefecture, an enchanting folk festival has been passed down through generations of children. The Enko Festival (エンコウ祭), held along the Ushirokawa River each year on the first Saturday of June, is a rare surviving example of a children's ritual dedicated to appeasing a water spirit known as "Enko" — a creature closely related to the famous kappa of Japanese folklore. This deeply atmospheric event, where youngsters build small shrines of sweet flag (shobu) leaves by the riverside and offer cucumbers and sake to ward off drowning accidents, provides a fascinating window into the spiritual relationship between rural communities and the waterways that sustain them.

Historical Background

The exact origins of the Enko Festival are unknown, but historical records confirm that similar rituals were practiced across the Tosa region (present-day Kochi Prefecture) at least since the early 19th century. A diary entry by Mori Kanzaemon dated June 16, 1806, describes a grand "Enko Festival" held along the riverbanks of Kochi's castle town, with many lanterns decorating the scene. In the past, Enko festivals were held throughout the Kochi Plain, but over time most communities discontinued the practice. Today, the tradition survives almost exclusively in the Maehama and Kue districts along the Ushirokawa River in Nankoku City, where roughly nine to ten neighborhood groups continue to observe the ritual.

What Is an "Enko"?

An Enko is a water-dwelling supernatural creature of Tosa folklore, equivalent to the kappa found in other regions of Japan. Legends tell of Enko dragging people and horses into rivers, teaching humans the secrets of medicine, and even fathering children with human women. The creature is believed to be particularly fond of cucumbers — a trait shared with kappa nationwide. These legends served a practical purpose: by warning children that Enko lurked in the rivers at dusk or during high water, communities instilled a healthy respect for the dangers of the waterways.

Why It Was Designated a Cultural Property

In March 2011, the Enko Festival of the Ushirokawa River basin was selected by the Agency for Cultural Affairs as an Intangible Folk Cultural Property Requiring Documentation Measures. The designation recognizes several distinctive features of the festival. First, it is one of the last surviving examples of a once-widespread water-spirit appeasement ritual in the Kochi Plain. Second, the festival is uniquely child-led: traditionally, boys from elementary and junior high school organized all preparations under the leadership of the eldest child, called the "taisho" (general). Third, the festival preserves a rich set of ritual elements — the construction of small shrines from sweet flag and reeds, specific offerings, lantern decorations, and fireworks — that reflect deep-rooted folk beliefs about the relationship between humans and water spirits.

Highlights and How the Festival Unfolds

Preparations begin in the morning, when children and community members clean the Ushirokawa River and its banks as a purification ritual. The children then gather reeds and sweet flag leaves to construct small shrine-like structures called "Enko huts" at the foot of bridges along the river. Each neighborhood group builds its own distinctive Enko hut, and styles vary from group to group.

The fragrant sweet flag leaves fill the air with a fresh, herbal scent. Inside each hut, offerings are placed on a shelf lined with cypress leaves: sliced cucumbers mixed with octopus (the Enko's supposed favorite food), sake, and sometimes fresh vegetables such as eggplant and tomato.

As dusk falls, lanterns around the huts are lit, creating a mystical atmosphere along the darkening riverbanks. Children and adults alike pray at the shrines for protection from water accidents in the coming summer. Afterward, fireworks are set off, and the community gathers for a feast prepared by the mothers — a joyful conclusion to the ritual.

Visitor Information

The Enko Festival takes place on the first Saturday of June each year along the Ushirokawa River in the Maehama and Kue districts of Nankoku City. The festival is a community event rather than a tourist attraction, so visitors are encouraged to observe respectfully. The best time to visit is in the late afternoon and evening, when the lanterns are lit and the atmosphere is most evocative. Nankoku City is easily accessible from Kochi Ryoma Airport, which is located just north of the festival area. The Kochi Expressway and JR Tosa Line also provide convenient access to the city.

Surrounding Attractions

Nankoku City and the surrounding area offer several points of interest for visitors. The Kochi Prefectural Museum of History and Folklore, located on a hilltop overlooking the Kochi Plain, houses exhibits on the region's folk traditions including the Enko Festival. Oka Toyotaro's Birthplace, a National Historic Site commemorating the birthplace of the famous Meiji-era politician, is also nearby. The city is part of the broader Kochi tourism area, with easy access to Kochi Castle, the Katsurahama Beach, and the scenic Shimanto River region for extended trips.