 The junction of the third corridor on the west and the paved way leading from the western gopuram to the Setumadhava shrine forms a unique structure in the form of a chess board, popularly known as Chokkattan Madapam, where the Utsava deities are adorned and kept during the Vasanthotsavam (Spring festival) and on the 6th day festival in Adi (July–August) and Masi (February–March) conducted by the Setupati of Ramnad.The outer set of corridors is reputed to be the longest in the world, measuring about 6.9 m in height, 400 feet each in the east and west and about 640 feet in the north and the south.The inner corridors are about 224 feet each in the east and the west and about 352 feet each in the north and the south.