I go away for two days to a conference and not only does somebody post a map, but people talk about it
The only real point I'd make is that the northern border of New Wales is about in the right place but too straight and New Wales and Argentina don't really have a common border yet. To get an idea of how things stand - if you look at this map then the road running from San Antonio Oeste Via Valcheta, Sierra Colorado and Maquinchao to San Carlos Bariloche is pretty much the northern limit of Welsh settlement and the Rio Negro from Carmen de Patagonies to Choele Choel is pretty much the southern limit of Argentina. If you then draw a line from Choele Choel to where General Alvear is you roughly get the boundary between between Argentina and the free(ish) Mapuche lands. It's also worth bearing in mind that of the subdivisions of Chile shown on that map, most of the 2nd and 3rd from the top are also Mapuche at this point.
The only real point I'd make is that the northern border of New Wales is about in the right place but too straight and New Wales and Argentina don't really have a common border yet. To get an idea of how things stand - if you look at this map then the road running from San Antonio Oeste Via Valcheta, Sierra Colorado and Maquinchao to San Carlos Bariloche is pretty much the northern limit of Welsh settlement and the Rio Negro from Carmen de Patagonies to Choele Choel is pretty much the southern limit of Argentina. If you then draw a line from Choele Choel to where General Alvear is you roughly get the boundary between between Argentina and the free(ish) Mapuche lands. It's also worth bearing in mind that of the subdivisions of Chile shown on that map, most of the 2nd and 3rd from the top are also Mapuche at this point.