Bit like this, the boxes are the regions:
As a user, I want to choose a region from a dropdown, and then this opens a web map/web app with only the relevant features being shown and centered into the relevant bounding box for that region.
The bit I am struggling to work out, is a good approach to do the bit in red above. Everything else is ok.
Just looking to brainstorm any ideas or send me some relevant links so I can do some homework before going down the wrong path. Thanks!
This is exactly what I have been looking for as well. With my research I have not found a solution other than creating individual web maps that you stated above. Hopefully someone will respond with a solution.