Garmin 820 Map Coverage?

[Nomadski]

I know my Garmin Edge 820 comes with European maps installed, but does this also include Tenerife?

 

[Edwardoka]

I know my Garmin Edge 820 comes with European maps installed, but does this also include Tenerife?

It will probably have them, but for reasons of limited storage space they will likely be severely lacking in detail.
Fortunately it's really easy to replace the stock garmin maps with ones generated from openstreetmap by following this tutorial:

https://www.dcrainmaker.com/2013/05/download-garmin-705800810.html