The Witcher show on Netflix will be filming on the Canary Islands, Spain, starting from March 2019. At least according to an email that was sent out to an actor who applied for a character that is simply named “Tall Man”. More precisely they will do the filming on the three islands of Tenerife, Gran Canaria and La Gomera.
The landscapes of the Canary Islands are beautiful. The islands are full of steep mountains, wild forests, endless meadows and grim lava fields – perfect for filming a fantasy TV show. The Witcher would be in good company: The Game of Thrones Prequel will film on the islands, too.
This is an exclusive piece of information I got from a reliable Spanish source, thanks to @luissgorrin24 .
Edit 01/21/19: It’s confirmed! Director Charlotte Brandström is location scouring on the Canary Islands!