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

Secrets

http://agasthyasecrets.blogspot.com/

Tributaries

https://www.google.com/search?q=Cauvery+Tributaries

calling

https://www.google.com/search?q=Cauvery+calling

arangar

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

Ganga

There is a story which describes how the river Kaveri (also spelled Cauvery) arrived on earth by sage Agastya. Once due to hot whether in south his wife Lopamudra fainted. There were no rains and people suffered intensely. The lands became parched and cracks appeared. Animals and birds could not get food or water, their suffering was beyond words. All over the land there was sheer misery lack of food and water made life unbearable. Agastya felt sad and approached lord Shiva for help. Shiva gave him small amount of Ganga in his Kamandala (small pot which he was carrying) and said wherever you spill this water the river will flow from there.

Since a demon named Surapaduman (Later killed by Lord Murugan) wanted to destroy the south with no water and food, planned to take the kamandala from Agastya,

Lord Ganesha took a form of crow and disturbed Agastya, perched on the Kamadala and thrown the kamandala on earth. Ganesh drifting water from Kamandala After touching earth, the water drifted out of kamandala and took a form a river Kaveri

http://en.wikipedia.org/wiki/Kaveri
http://www.cauvery.com/