The Parc des Buttes Chaumont is a popular picnic site in Paris, France. It is a large public park located in the 19th arrondissement of Paris and covers an area of 25 hectares. The park was designed by Jean-Charles Alphand and opened in 1867. It features a lake, grottos, waterfalls, cliffs, and an artificial mountain. The park also has a variety of plants and trees, as well as a variety of wildlife. Visitors can enjoy a picnic in the park or take part in activities such as boating, fishing, and rock climbing.