In which district of Andhra Pradesh is the Ratnagiri Fort located?

Q. In which district of Andhra Pradesh is the Ratnagiri Fort located?
Answer: Sri Sathya Sai
Notes: Ratnagiri Fort, a hill fort in Sri Sathya Sai district, Andhra Pradesh, spans two hills: Ratnagiri and Venkatagiri. It features temples, stepwells (kalyani, Pala Bavi), and is near the Andhra Pradesh-Karnataka border in the Rayalaseema region.