Lake Kawaguchi (河口湖) is located in the town of Fujikawaguchiko near Mount Fuji, Japan. It is the second largest of the Fuji Five Lakes in terms of surface area.
As with the other Fuji Five Lakes, the area is a popular resort, with many lakeside hotels, windsurfing facilities, camp sites, and excursion boats. Japanese white crucian carp and wakasagi were introduced to the lake in the Meiji period, and sports fishing is also popular.
Lake Kawaguchi is the most popular of the Fuji Five Lakes in terms of tourists, and has the most developed tourist infrastructure. The area also serves as a major hub for those wishing to climb Mount Fuji during the climbing season (July and August), and is also popular with photographers due to the panoramic views of the mountain from the shore.
In 2013 the lake was added to the World Heritage List as part of the Fujisan Cultural Site.
One of the best ways to visit the lake from Tokyo is the JR operated Limited Express Fuji Excursion. The train runs up to three times daily from Shinjuku Station in Tokyo.