Tyskland is the Scandinavian name for Germany, but ethymologically it seems to be different from 'twisk'. Tysk is said to refer to 'people', so maybe "our peoples'- " or 'thuus'(home)-land? anyway, this could lead to a prejudice thinking Twiskland is Germany.
"Twisk" means "inbetween", and may not refer only to Germany, but to local forrests, Karpaten, or also the regions that were under mixed influence of outside forces from Frya/Keltic ones. I propose one of these lands may have been the Auvergne, where famous Vercingetorix opposed Julius Ceasar. It is 'en route' to Marseille. The region is well know for it's vulcanoes that are not dead e.g. ; The 'Puy de Dome' formed about 10.000 years ago. And there may be more volcanoes elsewhere in 'borderlands'. Vulcanism was caused by the subduction of the european under the african plate, causing the alps to rise and ruptures around them opening up for magma.
(I couldn't find the thread on using volcanoes for timescale)
