Arizona State University at the Tempe campus is the largest of four campuses that compose Arizona State University. The campus lies in the heart of Tempe, Arizona, about eight miles (13 km) east of downtown Phoenix. The campus is considered urban, and is approximately 642 acres (2.6 km²) in size. ASU's Tempe campus is arranged around broad pedestrian malls and is completely encompassed by an arboretum. ASU has an extensive public art collection, considered one of the ten best among university public art collections in the United States. Against the northwest edge of campus is the Mill Avenue district (part of downtown Tempe) which has a college atmosphere that attracts many students to its restaurants and bars.