The Empty Frontier was the appellation given to a a region of space beyond the coreward reaches of the Romulan Star Empire in the 24th century. The Romulans sent several patrols into the region, but all were inexplicably lost. (LUG: The Way of D'Era: The Romulan Star Empire)
External links[]
- Empty Frontier article at Memory Beta, the non-canon Star Trek wiki.