An Ankanam is a unit of area measurement. It is similar to acre measurement. Nellore, Andhra Pradesh and Karnataka, Anekal, Bengaluru, Tirupati, etc are the places where this unit system is used.
In most the places, 1 ankanam =72 sq ft (6.7 sq meter). But in Tirupati, 1 ankanam =36 sq ft (3.3 sq meter)