Lake Poroto with a circumference of about 4 km and an area of 33 ha is located in Shiraoi Town in Hokkaido. “Poroto” means “a big pond” in Ainu. The area around the lake is a treasure box of wild birds and rare trees and flowering plants. Walking along the promenade around the lake, visitors can enjoy listening to the birds’ twittering and viewing pretty flowers. Japanese skunk cabbage and Trillium smallii, which are designated as rare species, grow naturally in this area. In 1978, the lake and its surrounding area were designated as Poroto Natural Recreation Forest by Forestry Agency. It was also selected as one of 100 Promenades in 2002. In winter, when the surface of the lake is frozen, people come to enjoy fishing lake smelts. Or skating on the natural skating rink is more popular among the people with their family. Nature remains untouched around this area. Lake Poroto is the mother of wildlife.