Shima Lake: A Cobalt Jewel in Gunma

Shima Lake, an artificial lake created by the Nakanojo Dam, is a jewel of Gunma Prefecture, famed for its captivating 'Shima Blue' waters. The striking blue hue, most intense during spring due to snowmelt, results from the transparency of the Shima River and the scattering of light by allophane particles in the water. The surrounding landscape provides a stunning backdrop, with vibrant greenery in spring and summer and fiery foliage in autumn. Visitors can explore the lake through various activities. Canoe tours are popular, offering a unique perspective of the lake's beauty and the surrounding forests. Hiking trails around the lake provide opportunities to spot local wildlife, including monkeys, boars, and tanuki (Japanese raccoon dogs). The Shima Ohashi bridge offers a panoramic view of the dam and the lake's clear waters, which can appear blue, turquoise, or dark blue depending on the weather and time of day. Located 8 kilometers from Shima Onsen, one of Gunma's most famous hot spring resorts, Shima Lake is easily accessible and offers a refreshing contrast to the onsen experience. The lake's serene atmosphere and picturesque scenery make it a must-visit destination for nature lovers and those seeking tranquility.