The town was located on the southern shores of the Lake of Steam, in the northeast section of the Border Kingdoms, between the kingdoms of High Mukshar and Middle Mukshar. It had a small harbor and was surrounded by low hills, which contained mines and farms.
The town was governed by the Arthlord, who was chosen by the two local temples. The position was similar to a mayor but also had the powers of a police chief and magistrate. The Arthlord acted as judge in all trials, which were held in public in the town square. Policy was drawn up between the temples, landowners, and the Arthlord.
The town had rich deposits of copper and iron in the surrounding hills, and as a result Arthyn had a thriving smelting industry. Fine daggers from the city, called "Arthyn fangs", were sought after across the Border Kingdoms. The town also had a reputation for healing, and a saying in the Border Kingdoms was "healing is at hand in Arthyn". This reputation was earned by the Witch of the Mists, who resided in Arthyn for many years and developed medicines that saved many lives over the years. Her medicines were still sold in local markets in the 1370s DR.
Peace was maintained by the town watch, the Lockgates. They were commanded directly by the Arthlord. There was a small militia as well, called the Badgelars.
- Darraskyn Eldron, the cleric in charge of the temple of Lathander, The Morningtable. He was originally from Tashalar. 
- Harrond Tralvus, current Arthlord in the mid-1370s. He was originally from Chondath.
A white pick, head to the upper left, and crutch, diagonally crossed on a green circle.
- Ed Greenwood (August 1995). “Elminster's Everwinking Eye: Our Tour of the Border Kingdom Continues”. In Duane Maxwell ed. Polyhedron #110 (TSR, Inc.), p. 7.
Adaerglast • Bedorn • Barony of Blacksaddle • Burntbridges • High Emmerock • Barony of Great Oak • Hawkgarth • Land of Two Princes • Nether Mukshar • Middle Mukshar • High Mukshar • Ondeeme • Owlhold • Realm of the Mount • Realm of the Ready Sword • Shandolphyn's Reach • Grand Duchy of Shantal • Realm of the Smoking Star • Suldamma • Swordpoint Streams • Talduth Vale • Thuntar