What "area" is the Watford Junction, Station Rd, Watford WD17 1AB?

I am trying to find a room to live on this app called "spare room" and to set an advert up, they are asking me to select an area, but I have no idea what to choose for the Watford Junction.
Is it London and surrounds?
The is it
West
North West
or
North London?

All the other options under these don't say anything about Hertfordshire
Borough   
or Watford so I am stuck!

Please help what to input. Right now I have it on Mill Hill, but that is nowhere near... :(

Hi and welcome to the Forum.

Watford Junction is a mainline/underground railway station in Watford, which is a town to the North West of London, in the county of Hertfordshire.  Google maps will help you find places around it.

If you want to find a room in Watford, just use "Watford".  I grew up in that part of London; Mill Hill would be of no use; assuming you would have to commute between the two, they are on different train lines and you'd have to first travel into the centre of London, to get a train out to Watford Junction.

Hope this helps.

Cynic
Expat Team