Thera was the home of Xyrillian engineer Ah'len.

In 2151, Ah'len showed Human engineer Charles Tucker III a representation of Thera in the holographic chamber aboard her starship.

In describing how the technology can change perspective, she explained that "We could walk all the way to the city, and you'd never know we were in this room." (ENT: "Unexpected")

When the simulation begins, the script notes depict an "Alien Landscape" and described "Through towering pinnables of crystalline stone, we see a distant City and a yellow Sea beyond." Though not made entirely clear what Ah'len was addressing when she pointed at "Thera", it was explicitly stated in the episode's script notes that she was "pointing to the city".
Thera was described by as a seaside city.
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