The exact address to find the Castle of Ternay is
9 street of the castle 86120 Ternay
Small precision for the users of GPS:
There are in France several villages bearing the name of Ternay, the one who interests you is in the North of the department of Vienne near the city of Loudun.
Latitude: 47 ° 2 ' 21.307"
Longitude: 0 ° 2 ' 30.17"