The Papagni originates in the
Nandi Hills of
Chikkaballapur district in Karnataka. It is a non-perennial river that is rainfed with its basin receiving 60–80 cm of rainfall annually. It traverses through a region of
granitic deposits and
red soil that is frequently affected by
soil erosion. It drains the districts of Kolar in Karnataka and the districts of
Chittoor,
Anantapur and
Kadapa in Andhra Pradesh. The basin covers an area of 8,250 km2. and drains 30
mandals of which 21 lie in the
Rayalseema region of Andhra Pradesh. It joins the Pennar near
Kamalapuram in Andhra Pradesh. == Land use pattern ==