The best road cycling routes around Heiweiler

Altkirch Altkirch is the historic capital of the Sundgau and lies on a striking rocky spur above the valley of the Ill. The town's origins date back to the Middle Ages. The Counts of Ferrette built Altkirch into a fortified town; from 1215 onwards, it was protected by town walls and towers. The characteristic layout, narrow streets, and remnants of the fortifications have been preserved from this medieval town plan to this day. Particularly worth seeing is the Vieille Porte, a former town gate from around 1245. For centuries, Altkirch was an important administrative and commercial center of the Sundgau. After the destructions of the Thirty Years' War, numerous buildings were newly erected. The representative town hall dates from the 18th century, built in 1778 according to plans by the Swabian architect Jean Nissler. In the 19th century, the town continued to develop: alongside its traditional importance as a market and trading place, industrial enterprises emerged, including the well-known Gilardoni brickworks. The 20th century also left its mark. After the First World War, Altkirch became part of the re-Frenchified Alsace. The memory of this period is evident, among other things, at the Vieille Porte, where a Borne Vauthier commemorates the former front line of 1918. The original Altkirch war memorial from 1927 was destroyed during the German occupation in the Second World War; preserved parts were later integrated into a new memorial. Today, Altkirch, with around 6,000 inhabitants, is an important center of the Sundgau. The historic upper town with its old houses, remnants of fortifications, the town hall, and the Sundgau Museum continues to shape the townscape. Source: Ville d’Altkirch – History of the town

I can only agree with Mattia: it's a short stretch of road through fields, but otherwise completely unspectacular, not even worth a tip...

Biederthal is often reached by car from Basel / the Birstal valley, but this point here is nothing special in itself.

Without any car traffic, the cycle path leads over gentle hills from Carspach to Ballersdorf, passing some exciting places such as the model airfield and the fish pond.

The former Altkirch-Waldighofen railway line has been converted into a cycle path in some sections, leading through fields and forests without disturbing car traffic. Highly recommended!

Before arriving at the Rail Trail, one is surrounded by magnificent half-timbered typical Alsatian houses from 100 years ago. The road is in need of some repairs.

A nice road offering with a few small bumps but nothing to impact ones speed. Enjoy the beautiful Alsatian scenery and architecture along the way.

A classic in the region, only rises slightly.