Alkenstar City is the capital of the duchy of the same name. Mostly, the city and the state are considered the same, despite the additional presence of Dongun Hold, Martel, and the entire river canyon in which the city stands. Alkenstar City stands atop the Hellfallen Cliffs overlooking a narrow valley, where the massive Alken Falls causes the Ustradi River to drop nearly 700 feet on its way into Nex. Many people consider Alkenstar City, Dongun Hold, and Martel to all be different districts of the same city. The high steel and stone buildings of Martel, two of which reach above the top of Hellfallen Cliffs and connect via skybridges to structures within the city proper, certainly contribute to this theory. Alkenstar City is forever shrouded in plumes of white steam and black smoke. Low buildings scarcely cover massive gears and machines of unknown industry that churn throughout the day. Visitors to the city frequently note the preponderance of soot covering the frequently shined brass decorations and brick -and-iron buildings. The oldest surviving bridge in Alkenstar City, known as New Bridge, was built several millenia ago and marks an astounding difference between it and Martel’s Old Bridge (only a century older).
Sources: Pathfinder Chronicles Campaign Setting