[1][2] There are a number of villages within the island, such as Allaipiddy, Mankumpan, Velanai, Saravanai, Puliyankoodal, Suruvil, Naranthanai and Karampon.

Velanai was marred by violence during the Sri Lankan Civil War, with the island being the main setting of the Allaipiddy massacre in 2006.

Received per-historic archaeological evidence of ancient life in Saatti(Tamil: சாட்டி) sea side[citation needed] suggested that there was a well-organized civilization emerged in this island.

In Dvapara Yuga (ended in 3102 BCE), Tarahan, the younger (third) son of Kasiyappa Munivar and Mayadevi, captured Nagatheevu & built a strong fortress and ruled from there.

The devas made their way to Mahakailasam and worshipped God Shiva with melting hearts.

Gods Shiva commanded Agni (fire) and Vayu (Wind) carried the six sparks and placed them in the river.

The young Murugan grew up and mother Parvathi gave the pointed spear (vel), that place is called Velanai.

Murugan went to Mahakailasam with his mother Parvati and paid his loving respect to his father Shiva.

In response to Shiva's command, Murugan organized himself into warrior stance and warred with Tarakan.

When Lord Muruga came down from Mount Kailas with his massive assisting warriors, the contingent camped at Senthitsannathi, which was later known as Sellachannithi.

It is surrounded by the Palk Strait and at a distance of 6 kilometres (3.7 mi) south-west of Jaffna town.