Which border did where he parc naturel régional du Haut-Jura is located follow 
Jura Mountains: The Jura Mountains (] ; ] ) French: "Massif du Jura" , (German: "Juragebirge" , Italian: "Massiccio del Giura" ) are a sub-alpine mountain range located north of the Western Alps, mainly following the course of the France–Switzerland border.
i don't know