Lake Ezu is actually made up of two smaller lakes, Kami-Ezu and Shimo-Ezu, that combine to a length of 2.5 kilometers, a perimeter of 6 kilometers, and a total surface area of approximately 50 hectares. The springs that replenish the lake pump out an average of 40,000 tons of fresh water each day. Even though Lake Ezu is bounded on two sides by the busy Densha-Dori and the even busier Route 57, the area around the lake is subdued and relaxing, making it a popular place for a quiet jog or an afternoon picnic. Lake Ezu is also an excellent place to cool down during Kumamoto's sweltering summer months.