Regional study scales and focus areas for the USGS Chesapeake Bay studies.

USGS conducts the majority of the science theme activities at regional scales in the watershed, with complementary local-scale studies in two focus areas, which include the Potomac watershed and estuary and the mid-Delmarva Peninsula. The primary regional scales are
 (a) the entire watershed,
 (b) the major drainage areas in the watershed, and
 (c) major landscape settings.