With walls of dazzling white stone beneath gray slate roofs, the picturesque chateau at Azay reflects the waters of the Indre river, 30 km (19 miles) southwest of Tours.
The water is a clear blue green and sparkling. 
mnli hypothesis: The water is a clear blue green and sparkling.  premise: With walls of dazzling white stone beneath gray slate roofs, the picturesque chateau at Azay reflects the waters of the Indre river, 30 km (19 miles) southwest of Tours.