Arnave is a commune in the Ariège department of southwestern France. Arnave is situated in the Pyrenees and is served by Highway D20. Th…Arnave is a commune in the Ariège department of southwestern France. Arnave is situated in the Pyrenees and is served by Highway D20. The town sits in a deep valley between mountain peaks, the tallest of which is 1,300 metres above sea level.