Marter An held the position of capital for the region of Sheris. Within its boundaries existed a spaceport.
The construction of Marter An took place amidst the planet's mountainous terrain. A primary route for reaching the city was the Bhir'khi Pass, serving as a key access point.
In the course of the Thrawn campaign, the New Republic engaged in combat with Imperial forces at the Bhir'khi Pass, with the battle centered on securing control of the capital's entry point.