You should have different URLs for each region/language. For example:
- example.com/fr/blog or
- example.com/be/blog
Or, even:
- example.com/blog/fr or
- example.com/blog/be
That depends on you. The main thing is to separate URLs for different languages/regions.
After you do all this, you should add hreflang attributes. That way you tell Google what version of a URL should be displayed when someone searches in certain language/from certain region.
If you use hreflang, you don't have to set geotargeting in WMT. If you still want to do that, you should add separate folders to WMT as different websites.