Penn maintains two arboreta. The roughly "The Penn Campus Arboretum at the University of Pennsylvania" encompasses the entire University City campus. The campus arboretum is an urban forest with over 6,500 trees representing 240 species of trees and shrubs, ten specialty gardens and five urban parks, which has been designated as a Tree Campus USA since 2009 and formally recognized as an accredited ArbNet Arboretum since 2017. Penn maintains an interactive website linked to Penn’s comprehensive tree inventory, which allows users to explore Penn’s entire collection of trees. Penn also owns and operates the Morris Arboretum in Chestnut Hill in northwestern Philadelphia. The Morris Arboretum is also the official arboretum of the Commonwealth of Pennsylvania.