Currently, on SummitPost, Julian Alps are divided in 8 subgroups. The Kanin group (Monte Canin) includes also all the fore-hills down towards the South, where Julian Alps lower in Po river plane. But these fore-Alps are very different than Kanin mountains. The area is very broad, nice for hiking, skiing and also climbing, so it deserves to be separated from the higher regions of Julian Alps. And, finally, also Italians call these mountains Prealpi Giulie and the natural parc, established in 1996 has the same name.
Even if called Prealps, these mountains are far from being all humble and hilly. As all Julian Alps they are steep, rocky and wild. The other characteristic of these mountains is, that they are formed in long ranges, stretching tens of kilometers, usually in the west-east direction. As they are lower than the central regions, they are covered also with dense vegetation which doesn't diminish the impact of wilderness they do on the observer. The southern part is of course more hilly, populated by people, who live there since ancient times. Especially fruitful is the SW border of the group, where on the edge of Po river plane many beautigul towns are flourishing - Venzone, Gemona di Friuli, Artegna, Tarcento, Cividale/Čedad, Cormons/Krmin and of course the both two big cities of Udine/Videm and Gorizia/Gorica. These towns and others are all worth visiting and sightseeing.
The area is inhabitated with Italians, with Furlani and with Slovenes. It is perhaps less known that Furlani people are speaking their own language, which differs considerably from the official Italian language. In many places tables with information are written in both languages, since joining the European Union, the same is more and more true also with places where Slovenian people live on Italian territory. A special linguistic and cultural case is Val Resia / Rezija. The valley lieas on Italian territory but has been for centuries inhabited by Slavic people. They are speaking a very distinct, archaic dialect, much different from other Slovenian dialcets (some even claim their Russian origin).
The only dilemma of bordering these mountains is delimiting them from Kanin group. My recommendation is to make a border in Val Resia and Val Uccea / Učja. This way the long ridge of Skutnik / Monte Guarda would still remain in Kanin group. Once done so, the eastern border is clearly formed by the valley of river Soča, separating these mountains from Krn group and from Northwestern Dinarides and the western border are rivers Fella/Bela and Tagliamento/Tilment, separating these mountains from Carnic Alps. The southern border is of course the Po river plane.
On the NW, Julian Pre-Alps are the highest. They rise steeply from the banks of rivers Fella and Tagliamento, then they stretch towards the East with a series of sharp and wild peaks. The northern borders are Resia and Uccea/Učja creeks, the southern borders are Val Venzonassa and Torre valley.
It rises south of Plauris-Musi range, so it's northern border is Val Venzonassa. It's eastern border is the valley of Torre/Ter river. On the northern part this group consists of a long and, despite its low altitude, still a wild ridge of Monte Chiampon / Veliki Karman. Just south of the highest summit there's a nice, panoramic balcony of Monte Cuarnan / Mali Karman. The rest towards the south are only much lower hills.
For more details, see the existing SummitPost page of Kobariški Stol!
This range is stretching in the west-east direction south of Uccea/Učja creek and south of the upper part of Torre/Ter river. It is still sharp and rocky on many places, but here Julian Pre-Alps are already losing their wilderness. Towards the South it is lowering with many side ridges, which are less important in the mountaineering sense, hosting many nice Friulian villages. Great area for biking!
North of Cividale/Čedad there's a hilly area where only a few hills are more important for hiking. This is also a nice biking area. Still the altitude difference towards the river bed of Natisone/Nadiža is more than 1000 meters.
Casting in literature, Matajur is a true symbol of Slovenian people, living beyond the present state border. It's a broad, quite powerful mountain, offering a lot to a mountaineering soul: hikes from all sides (also of 1200 m of altitude difference), nice ski tours, mountain biking and more... As on its southern slopes the road reaches 1320 m, there's also a hut there: Rif. Pelizzo. A road pass above Livek village divides Matajur from the long and panoramic Kolovrat ridge.
Also Kolovrat ridge is very special. Its panoramic road offers some of the most spectacular views in Julian Alps. Finding yourself there early in the morning or late in the afternoon, any time of the year, can be an unforgettable experience. By the grassy ridge also nice hiking trails go and you can visit many posts from the World War I which are arranged for tourist visit. Kolovrat is famous by a 25 hours break through in 1917, in which Erwin Rommel showed his war talent, performing one of the first "Blitzkriegs".
South of Solarje pass a long, predominantly grassy ridge begins, which is stretching in a NE-SW direction. It is all on the Slovenian side, as the border between Italy and Slovenia here goes by on its west side flowing Idrija/Iudrio river. Also atop this long ridge a decent road goes. So, you can combine in a biking tour the neighbouring Korada and Kolovrat ridges.
The last outpost of Julian Alps towards the South is the rocky, limestone Sabotin. Even if it is only 609 meters high, it offers some nice hikes from all sides and also a biking tour. The summit is very known from the World War I, when there were severe fightings. Otherwise, the frontline was running along Soca river, which forms here a true canyon. Still today you can see many rests from the war, some are arranged also for tourists visit. West of Sabotin there's a special area, which is different than the rest of Julian Pre-Alps. This is the hilly area of Goriska Brda. Very fruitful, landscape, made of flysh, reminds on the famous Toscana. All wineyards, orchards, nice villages on hills!
The most beautiful river of Julian Alps forms in its middle part the eastern border of our Pre-Alps group.
Nadiža river is sunny, warm and still very clear. Its sources are below Stol and Gran Monte, then it flows as a beautiful creek towards the south. Near Logje it turns eastwards and seemingly flows towards Soca river, but just before Kobarid it suddenly decides to turn southwards again carves a deep canyon between Mija and Matajur and finally gets out of Julian Alps at Žedad/Cividale.
While today's main road follows the river from Kobarid to Čedad/Cividale, in the past also paths along its upper flow towards the west were much used. Today still a romantic witness of those times stands - the 'Napoleon bridge' below Logje village.
Here are some attractions of this beautiful river and its valley:
This is the central river of Julian Pre-Alps. Its sources are below the wild Musi/Muzci range, then it flows towards the south. The river also has a characteristic blue colour.
The river forms the western boundary of Julian Pre-Alps.
On smaller creeks there are some nice waterfalls, worth of visiting. Sušec, on the northern slopes of Stol, is a popular canyoneering goal. Bončič, below Gran Monte, can be also reached by a marked path.
Julian Pre-Alps can best be reached from the West by Italian highways (Udine - Tarvisio) or from the East through the valley of river Soča.
The following roads/passes are cutting the area:
In addition to these there are many local and mountain roads, connecting villages in the southern area and running over some passes and along mountain ridges. Some were already mentioned.
On the southern side of the group there are many nice towns very worth visiting and sightseeing. Most of them have a history from the Ancient Roman times, some even a longer one. By the western side once an important Via Iulia Augusta ran. Along that Ancient Roman road are today's towns like Gemona/Gumin, Venzone/Venčon and others. They were end of 20th centurs heavilly destructed by an earthquake, but today they are well restored. In the south-eastern part there is Cividale/Čedad. Founded as Forum Iulii, the town was taken over by Langobardic tribe and was long time their capital. Many archeologic remains from that time are preserved.
A good mountain map: Tabacco: Prealpi Giulie - Valli del Torre, 1:25000.
In 1996 the Julian Prealps Nature Parc was established. Its headquarters are in Prati do Resia. For more details see the its official web page at: http://www.parcoprealpigiulie.org/.
In the whole area there are no official huts of mountaineering organizations. But you can sleep and eat in some private huts and with shephards on mountain pastures. Camping is officially forbidden, except in high regions for emergency reasons. But some areas are so remote that it is very unlikely that you would be chased if setting up a tent over a night.