Prior to reclamation, the circumference and area of Ogura-ike Pond were approximately 16 km and 800 ha, respectively, being the largest freshwater lake in Kyoto Prefecture in those days.
干拓前の巨椋池は周囲約16km、水域面積約800haであり、当時京都府で最大の面積を持つ淡水湖であった。