The Pancha Brahma kshetras are five temples which depict five faces of Shiva as per the Pancha Brahma concept of Shiva as Nirguna Brahma, the primordial form of the creator also called Sadasivam and his five aspects as follows
1. Sadyojyatha-creative form-Earth- West face - Ariyathurai temple
2. Vamadeva-protective--water-West face-Arani temple
3.Tathpurusha- concealing grace-East face- Suruttupalli
4. Easana-ethereal space-facing Akasha-transcendental-Ramagiri
5. Aghora-Destructive-Rejuvenative-South face-fire-Chinta manishwaram near Minjur
(Yet to visit)
Once Brahma was starting a yagna and used Arani wood to start it. After the fire water also started flowing and it came to be called as Arani River which flows into the bay of Bengal near pulicat.
Agastya consecrated five temples here on the banks of the Arani river and each was depicting one face/ aspect of Shiva . These are collectively called as the Pancha Brahma Kshetrams.
They are all in a 50 kms radius and can be visited in a day. Most of these temples are not having resources hence you may find them closed early.