Av Costanera Arturo Prat (known simply as Prat) is a major focus of activity, but the most important public buildings are on Plaza de la República. To the west, the Puente Pedro de Valdivia crosses the river to Isla Teja, a leafy suburb that is the site of the Universidad Austral and many trendy restaurants and bars. The Valdivia region is also home to Sur Chico's Parque Nacional Alerce Costero, which protects 24,000-hectares of the coastal alerce trees which give the park its name. It's located 137km southwest of the city and was declared a national park in 2010.