Wu Lao Peak is a sandstone peak formed in the Nanhua Period (0.8 – 0.68 billion years ago). The sandstone solidified due to heat coming through the fault. The crevice that formed in the rock collapsed after strong structural degradation. Eventually they turned into five steep overhanging rocks side by side facing Po Yang Lake, like five old men. Its beauty inspired the great Tang Dynasty poet, Li Bai（701-762AD) to compose the poem “Looking at Lushan Five Old Man Peak” praising the structure. Today the poem is still very popular.