Does anyone know the exact French Riviera location of the picnic scene between Grace Kelly and Cary Grant in the movie "To Catch a Thief"?

Not an exact lcoation, but here is a quote from a movie review: "On 14 September 1982, Grace Kelly was killed in an automobile accident in Monaco on the very same road as her famous chase scene in this film. The spot is not far from where she had a picnic scene with Cary Grant."

I believe the chase scene and Grace Kelly's accident were on the Grande Corniche, the highest of the three roads between Nice and Monaco.