Concept art and park map:Ghibli Park will be located on a 200-hectare plot of land on which the 2005 World’s Fair was held near Nagoya, Japan. The focus will be on bringing Studio Ghibli to life in a way that allows parkgoers to also enjoy nature.
Sources: http://www.bbc.com/news/world-asia-40128846 and https://generacionghibli.blogspot.com/2018/04/studio-ghibli-presenta-las-primeras.html and http://anime.reactor.cc/tag/Howl%2527s%2BMoving%2BCastle/new/10 and https://kotaku.com/first-look-at-the-studio-ghibli-theme-parks-official-co-1825523519 and https://www.seejapan.co.uk/press-releases/consumer/2017/06/02/studio-ghibli-theme-park-location-announced