As a sidetrip, take the D909 east to the Mont Veyrier cable car, continuing on to the pretty town of Menthon-Saint-Bernard and its medieval castle high above the lake.
The Mont Veyrier cable car is in the east. 
mnli hypothesis: The Mont Veyrier cable car is in the east.  premise: As a sidetrip, take the D909 east to the Mont Veyrier cable car, continuing on to the pretty town of Menthon-Saint-Bernard and its medieval castle high above the lake.