What is the BAS (Boundary and Annexation Survey)?
The Boundary and Annexation Survey (BAS) is conducted yearly to collect and maintain up-to-date information about legal boundaries, names and official status of counties, incorporated places, minor civil divisions and federally recognized American Indian reservations and/or off-reservation trust lands. The U.S. Census Bureau plans to include the Alaska Native Regional Corporations (ANRCs) in the 2009 BAS.