Hey! There are a few ways you could do this, but I’d recommend looking at tools such as Zapier or Integromat.
Basically you want to create logic that says:
“When a new record comes into #table1”
“Lookup #table2”
“Update record in #table1 with region from #table2”
Hope that helps! you should be able to do what you need quite simply, and without the help of a developer or automation expert, but if you do need any help, we are always here.