Guide
Ogunuma Swamp is a beautiful caldera lake formed by the ancient volcanic activity of the Nekoma Volcano, located in Kitashiobara Village, Fukushima Prefecture. Situated at an altitude of 1,090m, the area is surrounded by primeval beech forests and majestic mountains. The greatest highlight of this location is the "Ogunuma Swamp," which is designated as a National Natural Monument. The area is home to approximately 300 species of high-altitude marshland plants, allowing you to witness the incredible vitality of nature up close. The scenery in early summer is particularly breathtaking, offering a stunning contrast between the sculptural beauty of nature and the silent, mirror-like surface of the lake.
The formation of Ogunuma Swamp is a result of the geological history of the Nekoma Volcano. The caldera was created by a massive mountain collapse, and the depression was subsequently filled with water due to later volcanic activity. For many years, rigorous conservation efforts have been in place to maintain this precious ecosystem. Today, the area is designated as a National Natural Monument and a wildlife protection area within a National Park, meaning strict rules are in place to protect the environment. Visiting this site offers a chance to learn about the history of Japan's volcanic activity and the vital importance of nature conservation.
The most iconic sight at Ogunuma Swamp is the seasonal change of the marshland flora. From late June to early July, the southern part of the swamp is covered by a massive colony of Nikko-kisuge (daylilies). This golden landscape is a magnet for hikers and photographers worldwide. In early summer, you can also see the vibrant blooms of Rengetututsi (Japanese pieris). To allow for safe observation without damaging the environment, a network of wooden boardwalks totaling 843 meters has been installed. Walking along these paths provides a perfect opportunity to observe the diverse high-altitude plant life right beneath your feet.
The best time to visit is early summer, from May to July. The peak season for the Nikko-kisuge lilies is from late June to early July, when the landscape is at its most brilliant and golden. In winter, the area attracts enthusiasts for mountain skiing and snowshoeing. Because the scenery changes drastically with the seasons, you can enjoy a completely different side of nature depending on when you visit. For the most vivid colors and photography, we recommend walking the boardwalks during bright daylight hours.
Nature walks and hiking are the primary activities here. We highly recommend a