Kollidam - a semi-urban village. Kollidam is a semi-urban village lies between Chidambaram and Sirkali. It is situated on the southern bank of river kollidam. It is the northern most border of Nagapattinam district and the Kollidam river separates Cuddalore and Nagapattinam district. The real name of Kollidam village is Anaikaranchattiram. Its proximity to religious places made it a chattiram for pilgrims and traders in the past. The first major settlement of outsiders takes place probably during Vijaynagar period. Kollidam has a railway station since British times. There is an old building near Kollidam railway bridge. It was built in 1926. This building is now in dilapidated condition. In the southern part of Kollidam village lies Thaikkal. Reed plants are grown here and so it is famous for cane works. Shoot of the reed plants is used for making furniture and other handicrafts. The first recorded railway accident in kollidam block occurred in 1907 between Kollidam and Sirkali railway station, probably near Ayangudipallam. A train ran over an old blind lady. During that time, Kollidam station master was Deivasigamani. When the former chief minister of Tamil Nadu, Arignar C.M.Annadurai died, lakhs of people travelled by train to attend the funeral. Many people travelled by sitting on the top of the train. Old railway bridge in Kollidam had enclosed iron roof. People travelling on the top collide with the roof and many died. The Postal Index Code of Kollidam(Anaikaranchattiram) is 609102. Presently, Kollidam has three Banks (Indian Bank, ICICI, IOB), four marriage halls, a railway station, a police station and a post office.