/REGIONS [=id]

    Lists the information contained in the process region table for
    the specified region. If you do not specify a region, the entire
    table is displayed, including the process-permanent regions. /RDE
    and /REGIONS are functionally equivalent. When used with /PAGE_
    TABLES, this qualifier causes SDA to display the page tables for
    only the specified region or, by default, for all regions.