Purdue University System is a public university system within the U.S. State of Indiana that is anchored by the main campus of Purdue University in West Lafayette, Indiana that is a public land-grant university. With 18,209 acres (73.69 km²) and over 68,000 students, Purdue University System is one of the largest university systems in the United States composed of six campuses of various sizes. The main campus of Purdue University is particularly noted for its engineering, agriculture, and business administration programs, which consistently rank among the very best in the country and the world. From this heritage and reputation, Purdue University operates degree programs systemwide in its areas of technical, scientific, and industrial expertise.