Caoling Historic Trail is one of the most renowned hiking trails in northern Taiwan. Its northern entrance lies in Yuanwangkeng, Gongliao District, nestled in a tranquil valley ringed by mountains. Strolling the trail through pristine terraced fields and valleys, one hears only the chorus of birdsong and murmuring streams. In late summer and early autumn, wild ginger lily blooms white and fragrant, turning the place into a veritable paradise. At the Gongliao entrance sits Yuanwangkeng Riverside Park—small but richly landscaped. From here visitors can gaze over rustic terraced paddies and a natural ecological pond. Follow the stone path along the brook and you reach a serene pool, graced by a delicate arch bridge and twin pavilions. Cross the bridge to a tiny observation span: the crystalline water teems with Formosan khuli loach and river trout, shimmering in dense schools—a breathtaking sight. This quiet valley, alive with natural beauty, is an ideal destination for eco-tourism.