About the location (from here):
Mariamman Theppakulam, Madurai is located at about five kilometers east of the most famous Temple of the city, the Meenakshi Temple. An enormous water tank, it has its source in the river of Vaigai. The tank was built back in the year sixteen hundred and forty six. It covers an area of three hundred meters by two hundred and eighty five meters. There is a dais in the center of the tank. A Mandap is built on the platform in which there resides an idol of Lord Ganesh. People worship the Ganesh idol and He is better known as Lord Vigneshwara or Vinayaka. This Ganesh temple is known as tank temple as it is placed on a tank. Surrounded by a serene ambiance, the tank temple of Mariammam Theppakulam enjoys the status of being one of the most popular tourist spot in the region.

The temple religiously celebrates the Theppakulam Float Festival every year. It is a very colorful event, which attracts a huge crowd of devotees to the Mariammam Theppakulam Tank Temple. Deities of God Sundareswara and Goddess Meenakshi are placed on boats and are made to float in the river water. These boats are locally known as Teppam and thus the festival is named as Thep-pakulam Float Festival. The Teppams are gorgeously bedecked with beautiful flowers and with innumerable lights. When the boats dazzle with lights in the backdrop of blue river water, it is a sublime sight. The Theppakulam Float Festival is held every year around the months of January or February when the weather is clear and soothing.

Movies shot at this location:
Madurai Marikozhundhu from Enga Ooru Paattulaaran
AyyayyO song from Aadukalam
VizhigalilE from Kullanari Koottam
Scene where he gives one of his numerous missed calls to Remya from Kullanari Koottam
Thottu Thottu Ennai song from Kaadhal (around 4:26 in the video below)
Ivan Thaan Ivan Thaan song from Kaadhal
Enna Indha MaattramO song from Goripalayam