Have to agree with deboraey’s review of the Belgian series GR5 (here also titled “Missing Lisa”) – the characters are really nice and believable, the photography is just stunning at times, and the thought of walking 2000+ kilometres is wonderful… 9/10 from me as well.
Currently available in ZDF and/or in MediathekViewWeb (and for Android phones, in the Zapp App), German trailer is here if you can receive that (I think ZDF heavily geoblocks, so apologies if this is empty or not working for you):
In my opinion, well worth watching… enjoy.