Both the Glan river and the small Tiebel, main inflow of Lake Ossiach, run through the town.

There are three lakes in the vicinity to Feldkirchen The settlement may have developed at the site of the former Beliandrum mansio along the Roman road from Teurnia near Spittal an der Drau to Virunum, capital of the Noricum province.

The parish church Maria im Dorn, a Romanesque basilica with a Carolingian choir, is one of the oldest sacred buildings in Carinthia.

The bishops had the Amthof erected, the former seat of the local administration, today a place for cultural events and a small museum.

The village of Markstein south of the town centre is a former checkpoint at the border between the Austrian Empire and the Upper Carinthian part of the short-lived Napoleonic Illyrian Provinces.