Lachin Corridor is what the area in between Karabakh and Armenia is called. There is a Goris-Stepanakert Highway passing through this region, and everyone's definition of the term "Lachin Corridor" includes this highway. How far north or south of this highway is included in the term is a lot more vague, depending on the person speaking. It could include the entire former region of Lachin, and it could also include the former region of Kelbajar. Alternatively it could be a narrower definition.
The town of Lachin has been renamed Berdzor by the Armenians who have moved in and built a church.