Beihai Park is known as the world's earliest royal garden. An imperial playground dating back to the Tartar Jin dynasty (1115-1234), Bei Hai lies to the north of Zhong Hai and Nan Hai. The lake is Beijing's largest and most beautiful public waterway. On summer weekends the lake teems with paddleboats. The Five Dragon Pavilion, on Beihai's northwest shore, was built in 1602 by a Ming Dynasty emperor who liked to fish under the moon.