The source of Hubelj is located about three kilometers from Ajdovscina. The Hubelj River boils daily from numerous holes in the Karst underground that are more or less accessible. The source is especially interesting with the high water that falls from the higher vault in the mighty waterfalls.
View of the splashed water as the drops come from an altitude of about 240 meters to the bridge, which is 40 feet lower, is wonderful. The waters from the underground flow through three caves, which are the Spider Network, the Great Hubel Cuisine and the Eastern Hubel Cave. During the dry season, about 400 trenches were measured, ending with siphon rolls and piles. Hubelj Spring is one of the main karst springs in the Vipava Valley, also important for its integrity and purity, as it is one of the most potable waters in the valley. In the 16th and 17th centuries, iron smiths and iron foundations operated along the upper course of Hubble. At the time, Hubble was developing into an industrial center, which was the birthplace of today's buckwheat industry. At the time, Hubble was developing into an industrial center, which was the birthplace of today's buckwheat industry. At that time near Hubble an industrial center was being developed, which was the origin of the present-day buckwheat industry. Near the spring is located Guest house Gostilna pri izviru Hublja, where guests can enjoy delicious food and refreshing tea. From Pale Sports Park to the source of Hubelj leads a beautifully arranged Naturalistic Educational Trail.
At the 3,100-meter-long path, you learn more about the basic natural laws through 24 stations. You learn about typical rocks, tree species, shrubs, forest animals, aquatic ecosystems and other peculiarities and characteristics of nature.