[2] The river begins in Hainfeld with the confluence of the Fliedersbach and the Ramsaubach (also called the Innere Gölsen).

The Gölsen flows in an east-west direction and is around 15 km (9.3 mi) long, it has a difference in elevation of 80 metres (260 ft).

Along the Gölsen runs a rail line, the Leobersdorf railway [de; ja] from Traisen to Hainfeld.

In the past, the line was longer and continued to Kaumberg and farther into the Triesting valley.

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