The campus of Michigan State University is located in East Lansing on the banks of the Red Cedar River, and comprises a contiguous area of 5,200 acres (21 km2), 2,000 acres (8.1 km2) of which are developed. Built amid virgin forest, the campus opened in 1855 with three buildings, none of which remain. As an agricultural college, the campus was originally located several miles outside of the city of Lansing, but as the population of the college grew, the city of East Lansing developed just north of the area's main avenue.