Keyuan Garden is one of the four famous gardens of Qing Dynasty (1644-1911) in Guangdong Province. Lying in the west of Dongguan, it occupies an area of 2,200 square meters (0.54 acres) in a triangular-shape. It was built with blue bricks in 1850 by Zhang Jingxiu, a deposed military officer. Since 2001, the garden is under state protection as a national cultural treasure.