By definition, a Flat List doesn't have a parent. If you are importing into the list shown in your file LVL 2 FLAT.jpg then you are importing into the wrong list. Scroll down the list page in your model until you see the separator ----Flat Lists ----, these are the Flat Lists to which you should be importing the data from the csv files.
Later on, you will use a process to build the hierarchy Region > Country > Location
Einas "Give a Man a Fish, and You Feed Him for a Day. Teach a Man To Fish, and You Feed Him for a Lifetime"