Singavaram is located about 41 km from Viluppuram and 4 km from Gingee and comes under Viluppuram district.
The 7th century Cave temple of Lord Ranganatha, the tutelary god of Raja Desingh is on a hill top with about 150 steps. It is a good specimen of South Indian type of rock cut shrine.
The idol of Lord Ranganatha, in a reclining posture, measures 24 ft. in length which together with the inner sanctorum, is carved out of a single rock. It is said to be bigger than that of the idol in Srirangam. Like Thiruvananthapuram Ananthapadmanatha Swamy, the head, chest and leg portions of this Perumal have to be worshipped through 3 separate entrances. Mangalasnanam was done by Sri Ramanujar.
Source:
http://hill-temples.blogspot.in/2011/03/singavaram-sri-ranganathesvara-cave.html