UltraTrail course from the Tourist Office of the City of Huy.
“Actively visit this millennial city located on the banks of the Meuse in the Province of Liège, discover or rediscover its historical heritage including its four wonders by taking this trails offered by the City of Huy.” 

Information on the trail, which combines a number of shorter ones, can be found here: https://huyfortrail.org/index.php/parcours-permanents/
It also provides the link to downloading the gpx.