Neidong National Forest Recreation Area is located in Naxiao, Wulai, covering a total area of approximately 1191.34 hectares, with an altitude ranging from about 230 meters to 800 meters. The area features three streams: Nanshi Creek, Neidong Creek, and Wusha Creek. River ecology is a distinctive feature of the park, which offers three hiking trails: a waterfall viewing trail, a forest bathing trail, and a scenic trail. Neidong Forest Recreation Area has abundant water and a well-preserved natural ecosystem. Every spring and summer, when frogs and insects mate, the forest is filled with their loud calls to attract mates, hence the nickname "Baby Valley."