GEO2_ ML1998 identifies the household's circle within Mali in 1998. Circles are the second level administrative units of the country, after regions. A GIS map (in shapefile format), corresponding to GEO2_ ML1998 can be downloaded from the GIS Boundary files page in the IPUMS International web site.
The full set of geography variables for Mali can be found in the IPUMS International Geography variables list. For cross-national geographic analysis on the first and second major administrative level of any country refer to GEOLEV1, and GEOLEV2. More information on IPUMS-International geography can be found here.