Urkesh is a settlement mound, located in the foothills of the Taurus Mountains in Al-Hasakah Governorate, northeastern Syria. It was founded during the fourth millennium BC possibly by the Hurrians on a site which appears to have been inhabited previously for a few centuries.
Urkesh is a completely fictional country made for the show.
Elizabeth Alderfer wears coloured contacts in this episode as her eyes aren't normally quite as brilliantly green as they are in this episode.