It didn't have a specific name, "Plaguelands" is just the name given to the lands infected with the plague, though it originally referred to nearly all the lands of Lordaeron. In Wc3, even Lordaeron City was considered part of the Plaguelands.
Some parts of the region were/are called Lordamere Forest, everything else is pretty much the same.
after Illidan "with help from akama,keal.....etc" defeated the pet lord and become the Ruler of Outland, Akama told illidan now it's the right time to start healing up the temple, my brethren will work day and night to heal the temple, it would look like the demon's didn't touch the temple !!