A relationship would seem in order for this search to work.
Table1::Areas = Table2::Areas
Then, from a layout based on Table1, you can use * as the sole criteria to find all records in Table 2 with a matching value in areas. If you make this an Omit request, you will find all records in Table1 where the value in area does NOT match any record in Table 2.
And if you already have a different relationship linking table 1 to table 2, you can make a new Tutorial: What are Table Occurrences? of Table 2 and use it both for the relationship and your find.