When you're using Excel's map charts, the tool relies on Bing to recognise and plot geographic locations. Sometimes, certain locations may not be recognised correctly due to the way they're named or due to the lack of detailed geographic data for that region in Bing Maps.
Here are a few suggestions that might help:
Check the Spelling and Formatting: Ensure that the region names are spelled exactly as Bing Maps would recognise them. This might require some trial and error or searching on Bing Maps directly to see how it recognises various regions.
Alternate Names: Try using alternate names or more commonly recognised names for the region. For example, if a county has undergone administrative changes and has a new name, Bing Maps might not recognise the new one but might still have the old name in its database.
Add Additional Location Data: Sometimes providing additional data can help Bing Maps to better locate the area. For example, include the country or a larger administrative area in the data points.
GIS Software: For a more robust and customisable mapping solution, consider Geographic Information System (GIS) software like ArcGIS or QGIS. These tools offer more sophisticated mapping features and can handle a wider range of data inputs. You can often download region-specific shapefiles or geographic data that can then be used within these programs to create maps.
Online Resources: You can search for official government or local authority resources that might provide GIS data for the regions you're interested in. Often, these will be the most accurate and up to date.
Manual Override: If a particular region isn't being recognised, you could manually draw the area in a GIS program and then import the map into Excel, although this requires a bit of work and familiarity with GIS software.
For locating the names of regions as recognised by GIS, you would typically refer to official geographic databases or resources such as:
The official website of the country's geographic or mapping agency.
OpenStreetMap, which allows you to search for and view different geographic entities.
GeoNames, which is a geographical database that covers all countries and contains over eleven million placenames.
For GIS data specific to Northern Ireland, you can check resources such as the Ordnance Survey of Northern Ireland or the Land & Property Services.