The Butterfly Spring is situated at the foot of Yunnong Peak of Cangshan Mountains. The water here is crystal clear and the place where the spring bubbles up attracts people with its tranquility. The pool is some 50 square meters overall and above it is an ancient decumbent tree. This is the famous 'Butterfly Tree', so called as in the short interval as spring turns to summer, its fragrant blossom attracts thousands of butterflies. These small multi-colored creatures fly around the pool and settle on the tree in great clusters as they sip the nectar from its blooms. The vast numbers of butterflies are hardly distinguishable from the flowers as the whole tree pulsates with every color of the rainbow. This spectacular sight has given rise to a local festival when the Bai people gather at the tree on April 15th for the 'Butterfly Meet'. The romantic spectacle of the butterflies as they feed and mate in such abundance has become a symbol of courtship and each Bai youth will seek to engage with the love of his life by joining in with the traditional antiphonal singing. The Bai also refer to the spring as the 'Allegiance Spring' as it is here that true and lasting love may be found.