The Myrnmaros Rift
The Deeproad was shut 30 years ago by the emperor. The struggles in the Imperial City and ongoing civil war with the Northron Tribes are commonly cited as the reason. Legions could no longer be spared to guard the entrances, nor to protect travelers along this subterranean road.
It was successfully completed approximately three-hundred years ago. Upon being finished, it was used as a way to send settlers and Imperial legions eastward in an attempt to expand the Imperial state.
The city Easthaven was founded on the eastern half of the continent, at the end of the Deeproad. The city of Easthaven is, in fact, the end of the Deeproad. This fortress-city serves as the eastern “gate” to the Deeproad.