Lake Oku-Biwako still retains its tranquil natural beauty. There is a wonderful driveway there that allows visitors to enjoy the varied scenery. This driveway is 18.8 km long and weaves through the mountains from Tsukide Pass to Tsuzuraozaki. In particular, from the main Tsurarao Observatory, you can see more than a quarter of Lake Biwa, including Chikubu Island. On a clear day, Mt. Ibuki can be seen in the distance. Visitors can fully enjoy the sky drive with the nature of Oku-Biwako under their eyes.