[Rilgamon]

For one of my addons I use this function. It does not return the "old" values. So you need to find the right values for your addon.

local function getContinent()
    local mapID = C_Map.GetBestMapForUnit("player")
    if(mapID) then
        local info = C_Map.GetMapInfo(mapID)
        if(info) then
            while(info['mapType'] and info['mapType'] > 2) do
                info = C_Map.GetMapInfo(info['parentMapID'])
            end
            if(info['mapType'] == 2) then
                return info['mapID']
            end
        end
    end
end