Oko Waterfall, Yakushima

Oko Waterfall stands as the tallest waterfall on Yakushima Island in Kagoshima Prefecture, with an impressive height of 88 meters. Located between Kurio and Nagata on the southwest coast of the island, this natural landmark has earned prestigious recognition. In 1996, the waterfall was selected for Japan's list of 100 best waterfalls, cementing its status among the country's most celebrated cascades.

Yakushima is known as one of the wettest places in Japan, a characteristic that directly contributes to Oko Waterfall's dramatic appearance. The waterfall cascades in two streams down to an emerald-green plunge pool below, creating a powerful visual spectacle. The volume of water varies significantly with weather conditions, and between July and October during typhoon season, the river occasionally overflows and the waterfall becomes most powerful and impressive. However, during rainy periods, the gorge can flood quickly, making the waterfall unreachable and dangerous.

Visitors can approach remarkably close to the falls for an immersive experience with nature's raw power. Rocks near the water's edge tend to become quite slippery, so caution is necessary. The site also features Oko Spring (Oko Yusui) nearby, which is selected as one of Japan's 100 most excellent natural water sources and is believed to be good for health. Wildlife enthusiasts will find the area rewarding, as the emerald green basin contains several kinds of gobies, while wild birds such as brown dippers, grey wagtails, and kingfishers inhabit the surrounding area.

By car from Miyanoura, the journey covers 42 kilometers and takes approximately one hour driving counterclockwise. From Anbo, the shortest route is clockwise across the southern part of the island, covering 30 kilometers in about 50 minutes. The site is wheelchair-accessible from the parking lot.

For those using public transportation, local Yakushima Kotsu buses to Oko Falls run infrequently from Miyanoura Port, with the journey taking around 90 minutes. As of 2020, three buses per day go all the way to the waterfall at stop #129, and buses wait around 30 minutes before returning. Entrance is free, though parking may incur a small fee. The walk from the parking area to the falls takes only minutes, making this one of Yakushima's most accessible natural attractions.