Tanks have traditionally been an important source of irrigation in Andhra Pradesh, particularly in the:

The other options are incorrect because:

• The Coastal plains are a fertile region that receives more rainfall than the Rayalaseema region. Tanks are not as important for irrigation in this region.
• The Eastern Ghats are a mountain range that runs through Andhra Pradesh. Tanks are not as common in this region because the terrain is not suitable for their construction.
• The Deccan Plateau is a large plateau that covers most of Andhra Pradesh. Tanks are found in all parts of the Deccan Plateau, but they are more important in the Rayalaseema region.