Osorno sits in sight of Volcán Osorno, an active but minor volcano. The city's most prominent geographical feature is the Rahue River that runs north-south through its center. A smaller stream breaks off as well, running east before turning south and giving the city some natural boundaries. Located near the river front on the east side is the city's heart, the Plaza de Armas, a large, one-block park with fountains, benches, and tree-lined avenues. On the park's east side is La Catedral of Saint Matthew, one of the city's major landmarks, notable for its modern architecture. The cathedral serves as mother church of the Catholic Diocese of Osorno. Along the south side is Juan Mackenna Avenue, the city's major city centre street. Other points of interest are the main campus of the Universidad de Los Lagos and the Osorno Rodeo Stadium. The recently opened casino Plaza Sol de los Lagos is a new popular attraction for tourists and locals alike.
Osorno hosts a number of annual celebrations. The Festival de la Carne y la Leche (Milk and Meat Festival) is a music festival held annually in late January, features performances by national music pop singers and bands. The Festival del Folklore Campesino(Country Folk Festival) held annually in mid-January, features performances of regional music folk artists.
Another celebration is the Feria Ganadera Sago Fisur (Sago-Fisur Cattle Fair) held annually in early November, hosted by the largest ranch in the area highlights the current state of agricultural activity. Fireworks displays are held every year around the city on September 18, the Chilean national Day, commemorating independence from Spain.
Osorno is also a gateway for many tourist attractions. Puyehue National Park is a major attraction, with pristine lakes, forests, and game preserves. The volcanic area provides natural hot springs, now the site of the Aguas Calientes spa. Puyehue Hot Springs is adjacent to the park.
Los Lagos Region was named