Question: where are lost sectors on nessus?
Answer: Glade of Echoes. The Carrion Pit. Once again, look for the map marker (middle of the region) and look for the entrance. ... 
Artifact's Edge. The Orrery. Find the map marker in Artifact's Edge (upper right side) and once there, find the entrance. ... 
The Tangle. Ancient's Haunt. This one is easy to find. ... 
The Cistern. The Conflux.