Killai is a small settlement situated about 50 km from Cuddalore in Cuddalore District. Chidambaram and Parangipettai are neighboring towns. The place covers an area of around 16 sq km.
Killai can be accessed by road from Cuddalore and Chidambaram. The nearest airport is Tiruchirapalli Airport and the nearest railway station is Chidambaram Railway Station.