Tython - Elarian Trail: -33, -101
This Datacron is in a cave on a mountainside. East from the Forward camp, is the entrance to the cave located in Flesh Raider Territory at -28, 55. Simply follow the cave path, killing a few level 6 mobs along the way for the Datacron and a wonderful view.
Tython - The Forge: -93, 919
South of the Forge Remnants, there is a path starting at -175, 802 that leads to the Datacron. The Datacron is on a slightly raised area with a "strong" flesh raider worshipping it.
Tython - Upper Kaleth: -642, -70
From the Forward camp proceed to the Ruins of Kaleth, up the stairs to the second level and to the first building on the right. Once inside the building, climb the rubble on the left and then up the fallen tower you'll see on your right. Keep right, passed the stump and the tree.