Katano-kamoike is a permanent freshwater lake in Katano-cho, Kaga City, Ishikawa Pref. It has an area of 1.54 ha and a depth of 3.6 m. The Lake is designated to a Ramsar Site as well as a Natural Monument of the Prefecture. The Lake is surrounded by rice paddies, the depth of which is designed to be shallow so that they can go under the water when the water is dammed in fall. That is, the rice paddies filled with water are connected to the pond, creating an expanded marshy area. The site is an important stopover point for many species of birds in winter. The number of species and individuals are said to be the largest in Japan. Rice agriculture taking advantage of the geese behaviors has been practiced in this area. As weed is eaten by geese flying over to rice paddies in search of food, farmers don’t have to use chemical herbicides. Their droppings function as organic fertilizer. This harmonious coexistence with geese is ideal, but on the other hand, there are several problems seen in recent yeas including a decrease in the number of rice paddies, increasing use of dry farmland, and a decline in the number of migrating birds.