GEO_BF2010 (V101_BF2010) indicates the region of Burkina Faso where the respondent was interviewed. DHS units in the 2010 Burkina Faso survey are equivalent to regions.
Other sample years have their own sample-specific geography variables. There is also an integrated variable, GEO_BF2003_2010, that provides spatially consistent units over time.
A GIS map for GEO_BF2010 (in shapefile format) can be downloaded from the DHS Program Spatial Data Repository [URL omitted from DDI.] Boundaries page.