All the seven places are villages situated in the river Cauvery delta

http://6tri.blogspot.com/search/label/Somaskanda

Jambu

Once Parvati mocked Shiva's penance for betterment of the world. Shiva wanted to condemn her act and directed her to go to the earth from Kailasam (Shiva's abode) to do penance. Parvathi in the form of Akilandeswari as per Shiva's wish found Jambu forest (Thiruvanaikoil) to conduct her penance. She made a lingam out of water of river Cauvery 

https://www.google.com/search?q=Jambukeswarar

Comic Song
https://www.google.com/search?q=Jambulingame

Temples at Par with Kashi

This temple is one of the six temples along the banks of the Kaveri which are considered equivalent to the Kashi Vishwanath Temple. These temples are :

1. Aiyarappar Koil, Thiruvaiyaru
2. Mahalingeswarar Koil, Thiruvidaimarudur
3. Mayuranathaswamy Koil, Mayiladuthurai
4. Chayavaneswarar Koil, Sayavanam
5. Swetharanyeswarar Koil, Thiruvenkadu
6. Srivanchinadhaswamy Koil, Srivanchiyam

Blogs

http://divyadarisanams.blogspot.in/2009_11_01_archive.html
https://rajamala.wordpress.com/tag/equivalent-to-kasi/

Mahalingeswarar

Hindu legend, Mahalingaswamy is the centre of all Shiva temples in the region and the Saptha Vigraha moorthis (seven prime consorts in all Shiva temples) are located at seven cardinal points around the temple, located in various parts of the state.The seven deities are 

1. Nataraja in Chidambaram Nataraja Temple at Chidambaram, 
2. Chandikeswarar temple at Tirucheingalur, 
3. Vinayagar in Vellai Vinayagar Temple at Thiruvalanchuzhi, 
4. Muruga in Swamimalai Murugan Temple at Swamimalai, 
5. Bhairava in Sattainathar Temple at Sirkali, 
6. Navagraha in Sooriyanar Temple at Suryanar Kovil and 
7. Dakshinamoorthy in Apatsahayesvarar Temple, Alangudi at Alangudi, Papanasam taluk. 

The other deities of a Shiva temple associated with Mahalingeswaraswamy are 

1. Durga in Thenupuriswarar Temple at Patteswaram, 
2. Somaskanda in Thyagaraja Temple, 
3. Tiruvarur at Tiruvarur and 
4. Nandi at Tiruvavaduthurai Temple at Thiruvaduthurai.

http://www.thiruvidaimarudur.com

Birth Place of
https://sadhanandaswamigal.blogspot.in

Tube
https://www.youtube.com/results?search_query=Mahalingeswarar

Wiki
https://en.wikipedia.org/wiki/Mahalingeswarar_Temple,_Thiruvidaimarudur

Also
https://www.google.com/search?q=27+Nakshatra+Pools+Mahalinga

Blog
http://tamilnadu-favtourism.blogspot.in/2016/01/mahalingeswarar-temple.html

Slides
https://www.slideshare.net/search/slideshow?searchfrom=header&q=Thiruvidaimarudur