Röstigraben

Röstigraben (German pronunciation: [ˈrøːstiˌɡraːbən]; lit.'Rösti ditch' or 'Rösti trench', also transcribed Röschtigraben to reflect the Swiss German pronunciation [ˈrøːʃtiˌɡrabə]) is a term used to refer to the cultural boundary between German-speaking Switzerland and Romandy, the French-speaking parts. There is also the term Polentagraben, referring to the boundary between German-speaking cantons and the Italian-speaking canton of Ticino.

The term first appeared during World War I, when neutral Switzerland stood between the warring German Empire and the French Republic.