Developed land includes urban and built-up areas and rural transportation land.
The MSA Central Cities are indicated by black squares. The data have been aggregated such that dots are placed by hydrologic units within each state. The data have been masked and dots do not appear on areas determined to be 95 percent or more Federal land. Data for Puerto Rico and the U.S. Virgin Islands are aggregated by 6-digit hydrologic unit. NRI maps reflect national patterns rather than site- specific information.