Trehkopf, Mountain summit in Fellering, France

Trehkopf, also called Treh, is a 1,266-metre summit in the southern Vosges on the Route des Crêtes at Le Markstein. Its broad, rounded dome is mostly grass, with dark woodland on the lower slopes and open grassy ground above. A pale road curves across the right side of the summit area, where a few small structures stand, and a track runs up the central grassy face toward the top.

The sources document no wartime or border-dispute role for the Trehkopf; its recorded history is as a free-flight site. It lies on the Route des Crêtes above Le Markstein, and its launches have hosted national and international competitions, among them the International FAI2 Palz-Alsace-Open.

The name Treh, used alongside Trehkopf, is the local short form heard around Le Markstein. The open grassy summit serves as a gathering ground for paraglider and hang-glider pilots, and the site regularly hosts national and international competitions such as the International FAI2 Palz-Alsace-Open.

The Trehkopf lies on the Route des Crêtes at Le Markstein, in the communes of Fellering and Ranspach. Launch sites above 1,200 m face northwest to southwest, and landing fields near Fellering and Oderen lie almost 800 m below. With the right wind, a top landing on the open summit is possible.

The Treh hosts several launch sites above 1,200 metres, with take-off directions from north-west to south-west. In suitable wind, pilots can land back on the summit itself (top landing) thanks to the broad open grassy area. The site has hosted the international FAI2 Palz-Alsace-Open.