Avari

The Avari or East-Elves are those elves who did not go to the west in the elder days, instead they spread to the Lands east and south due to the wars between elves, dwarves, orcs and men in the first Age.

Tribes of the Avari are known live or have lived in Helcarth (or Helkanen), Helcar Sael, northern and southern cuivienen, Myr, Urd, címóníemor, Rhûn, Rhovanion, Eriador, Gondor, Haradwaith, Ralian, Drel, Mûmakan, central Endor, Uiven.

Speculations
The very first mention of an elvish people that could be considered Avari in Tolkien´s Works are the Hisildi from the Book of lost tales, elves living in a Land called Palisor in eastern middle-Earth between the Sea of Cuivienen and Hildorien to the south and ruled by a sorcerer-king callen Thû or Túvo.Some of these elves were led to the west by a leader called Tareg after the Battle of Palisor, these could be identified with the Penni, the Avari who had intermixed with the Nandor and had become the Silvan-Elves, and other avari tribes mentioned tohave lived in Beleriand, Eriador and Gondor.The other five tribes mentioned, the Windan, Hwenti, Cuind, Kinn-Lai and Kindi could be identified with the elves of Eriador, Haradwaith, Drel, Mûmakan and the east-plain.Two other avari tribes, the Hwendi and Kwindi are hypothetical and might linguistically be the ancestors of the latter five tribes.The Penni are believed to be Nelyarin-Avari while the other five tribes are believed to be Tatyarin-Avari.In general the Nelyarin-Avari are believed to resemble more the Teleri Elves, as Sea- or wood-Dwellers and either sea-farers of hunters and the Tatyarin-Avari to resemble more the Noldor as craftsmen, cave-dwellers and warriors.