If you wish to explore the extraordinary phenomenon of Purple Emperor Butterflies, head to the Moulin Purple Emperor Butterfly Ecological Park in Moulin, Kaohsiung. This area serves as the main destination for the annual butterfly season activities. By following the trails within the park, you can reach the Purple Emperor Butterfly Valley trail to personally experience the breathtaking sight of thousands of butterflies dancing in the air. "Purple Emperor Butterfly Valley" is not a specific geographic name but rather a term describing the ecological phenomenon of clusters of butterflies overwintering in the region. These sites are primarily distributed in the mid to low altitude mountainous areas traditionally inhabited by the Paiwan and Rukai indigenous tribes within Kaohsiung, Pingtung, and Hualien counties. From October to February of the following year, over a million Purple Emperor Butterflies migrate from the north to the warm and sheltered valleys at the foot of the Dasi and Dawulang Mountains in southern Taiwan, forming a world-class butterfly spectacle. The Moulin Purple Emperor Butterfly Valley is renowned alongside the "Monarch Butterfly Biosphere Reserve" in the Americas as one of the world's two remaining major butterfly sanctuaries where butterflies overwinter. It has also been rated as a three-star must-visit destination in the Michelin Taiwan Green Guide. Every winter, visitors to this natural treasure trove can witness the magical sight of swarms of Purple Emperor Butterflies in flight, experiencing one of Taiwan's most precious ecological treasures.