The moolasthanam or garbhagriha ("womb chamber", central shrine) of Nagapooshani Amman and her consort Nayinar Swami (Shiva) are in traditional Dravidian Hindu architecture. The inner wall of the temple together with the outer wall of the central shrine create a pradakshina (path) around the garbhagriha. The entrance is extensively decorated with paintings, sculptures and oil lamps. Over the garbhagriha is a 10 feet high vimana (tower). The garbhagriha has two entrances - the main entrance facing East, from which the Moolamurtis (consecrated deities) can be viewed and one facing South, from which the Utsavamurtis (festival deities) can be viewed. A unique feature of this temple is that Nayinar Swami and Nagapooshani Amman are installed together as if they are one; granting darshanam to devotees as Shiva-Shatki (the primeval energies of the cosmos).
The temple also includes the following upadevas (subordinate deities): Ganesha (Ganapathi), Bhuvaneswari, Kartikeya (Subrahmanya) with consorts Valli and Devayani, Navagraha, Surya, Chandra, Bhairava, 63 Nayanars, Nalvars and Chandikeswarari.
Gopurams
The Raja Raja Gopuram is the largest of the three gopurams that adorn this temple. The largest of its kind in Sri Lanka, it soars to the height of 108 feet (33 m). It has over 2000 intricately sculpted and painted figures on all four sides. It has 9 passages and 9 golden kalasas. From a distance it appears to crown the much older East Gopuram, and hence is known as "Raja Raja Gopuram" ("king of kings tower"). It was constructed from 2010 - 2012 with the efforts of artists from Tamil Nadu, India. Mahakumbhabhishekam (great temple revival ceremony) was held in late January 2012. This event was attended by 200,000 devotees from various cities and towns as far as India, Europe, Australia, and North America.
East Gopuram is the oldest of the three gopurams on the modern day structure. It opens facing the rising sun across the sea in the East. It rises to the height of 54 feet from the base. This gopuram originally had the fewest sculptures. During the renovation period, a number of new sculptures were added and painted in brighter colours to match the newly constructed Raja Raja Gopuram. Upon entering this gopuram, one directly faces the Moolamurtis (consecrated deities).
The South Gopuram was built in the early 1970s. It opens facing South. It rises to the height of 54 feet from the base. During the renovation period, sculptures on this gopuram were also painted in brighter colours to match the newly constructed Raja Raja Gopuram. Upon entering this gopuram, one directly faces the Utsavamurtis (festival deities).
Although this gopuram is in the South-East corner of the temple complex, the South East Gopuram also faces South. Built in December 2011, its primary purpose is to welcome those coming from within the island to worship the Goddess, and visitors from the nearby Naga Vihara (Buddhist Temple). It reaches the height of about 20–25 feet. It is the smallest gopuram and has the fewest sculptures. It was also painted in bright and vibrant colours to match the other gopurams.
Mandapams
The Vasantha mandapam is used for special poojas during festivals and fasting days to house to Utsavamurtis (festival deities). It is grand in manner. It can directly be viewed from outside through a newly constructed archway on the Southern wall of the temple.The Vahana mandapam houses the various vehicles the Utsavamurtis (processional deities) are seated upon during temple festivals. It is located on the North wall of the temple. It houses nearly 50 different vehicles. The most impressive being Ravana-Kailasa Vahanam. This vehicle depicts the demonized King of Lanka and ardent devotee of Lord Shiva; Ravana lifting Mount Kailasa while peacefully playing a makeshift veena created from one of his heads and arms by plucking the veins and arteries to soothe Lord Rakshaseshwara (who is the Lord of the Rakshas (of which Ravana is one), Sri Kailasa-Naayinaar Swami). It is believed that Ravana resides within this vehicle and hence it always attracts thousands of devotees when in use. It has become an indisputable icon of this temple due to the myths that surround the visit of Ravana to the island to offer poojas to Lord Rakshaseshwara (who is the Lord of the Rakshas, Sri Kailasa-Naayinaar Swami).
The Kalayana mandapam is used for conducting marriage ceremonies. It is located on the Northern premises of the temple property.The Annapoorneshwari Annadhana mandapam is used for the distribution of free food during festivals and social events. It is located on the Northern premises, nearby the Kalayana Mandapam. Oftentimes this venue is used to serve wedding feasts after wedding ceremonies which are held at the Kalayana Mandapam. It houses Annapoorneshwari Amman, the Hindu Goddess of nourishment, however regular poojas are not offered here.
The Amuthasurabi Annadhana Mandapam is used for the distribution of free food everyday to all those who visit the temple. It is managed and funded by the Nainativu Sri Nagapooshani Amuthasurabhi Annadhana Society (நயினாதீவு ஸ்ரீ நாகபூசணி அமுதசுரபி அன்னதான சபை - established in 1960). The society is collecting donations from all over the world to serve free food in its mandapam. It is located 2 mins walk from the Southern premises of the temple property. This mandapam serves to validate the values that are mentioned in the ancient Tamil epic of Manimekalai. The epic is set in both the harbour town of Kaveripattinam, the modern town of Puhar in Tamil Nadu, and in Nainativu, a small sandy island of the Jaffna Peninsula. The story follows the following plot: The dancer-courtesan Manimekalai is pursued by the amorous Cholan prince Udyakumaran, but rather wants to dedicate herself to a religious celibate life. The sea goddess Manimekala Theivam (Manimekalai Devi) puts her to sleep and takes her to the island Manipallavam (Nainathivu). After waking up and wandering about the island Manimekalai comes across the Dharma-seat, which was placed there by Lord Indra, on which Buddha had taught and appeased two warring Naga princes. Those who worship it miraculously know their previous life. Manimekalai automatically worshiped it and recollects what has happened in her previous life. She then meets the guardian goddess of the Dharma seat, Deeva-Teelakai (Dvipa Tilaka) who explains her the significance of the Dharma seat and lets her acquire the magic never-failing begging bowl (cornucopia) called Amurta Surabhi ("cow of abundance"), which will always provide food to alleviate hunger. As such, devotees and visitors are welcomed to enjoy a traditional meal after visiting the temple.
The Sri Bhuvaneswari Kalai Aranga Mandapam is used for various performances in dance, music and art. It was recently renovated and repainted in 2011 to suit the design of the newly constructed Raja Raja Gopuram. Common performances in this mandapam include bharatanatyam, mridangam, nadaswaram and sankeerthanam.
Ambala Veedhi
This is the outside of the temple structure and forms the outer pradakshina (path) around the temple.
Nandi (Sanskrit: नंदी, Tamil: நந்த), is now universally accepted to be the most common mount of Lord Shiva and the gatekeeper of Shiva and Parvati. This close association of Shiva, Parvati and Nandi explains the presence of a statue of Nandi at the gateway of the temple. This statue is approximately 8 feet high and faces the Moolamurtis directly through the East Gopuram. It is undoubtedly the only large sized Nandi of its kind in Sri Lanka.
The temple administration removed the silver-plated dwajasthambam ("kodi maram"; flag post) in late 2011 to allow for renovations to the temple. It is expected that a new brass-plated dwajasthambam will be installed before June 2012 to replace the one that had been removed. Currently the temple does not have a substitute.
The Nainativu Nagapooshani Amman Temple chariot, is used to carry the Utsavamurtis (processional deities). The chariot is usually used only once a year for the festival Ratholsavam (Tamil: Ther Thiruvizha, "chariot festival"), which is drawn by several thousand devotees around the outer pradakshina (path) of the temple. It reaches the height of 35 feet and is covered with various sculptures depicting the history of the temple. Two other slightly smaller (30 feet) chariots for Ganesha and Kartikeya with consorts - accompany the main chariot. It is one of the largest chariots in Sri Lanka.
The Kailasa-roopa Pushkarini is a temple tank, located on the Southern premises of the temple. It was recently renovated in 2011 and has a 15 feet high sculpture of Sri Nagapooshani Amman embracing Sri Kailasa-Naayinaar Swami atop the famous Ravana-Kailasa Vahanam. A unique feature about this sculpture is that the cobras with their open hoods, spit water resembling a fountain. Since the renovation, visitors are prohibited from entering its waters.
Another temple tank, Amrutha Gangadharani Theertham is located approximately 1 km from the temple on the western shore of the island of Nainativu. It was built by Muthukumara Swamiyar (a resident saint of Nainativu) in the early 1940s. It is nearby the Nainai Siva-Gangai Temple and is accessed by flights of stone steps leading from the small stone shrine.