Annan Koil is a village near Sirkazhi in Mayiladuthurai district of Tamil Nadu, (South India).
The soil is alluvial and the village is well irrigated by the river Kaveri which flows into the Bay Of Bengal.
Although this is a delta region, the people here mainly depend upon seasonal rainfall.
A famous Vishnu temple Annan Perumal Koil is located here.
The temple is one of the 108 Divya Desams revered by the 12 poet saints, the Alvars, the Tamil poet-saints and followers of Bhakti.