{"id":100625,"date":"2026-07-29T04:32:51","date_gmt":"2026-07-29T04:32:51","guid":{"rendered":"https:\/\/www.s1trail.com\/sentieri-cai-carso\/"},"modified":"2026-10-17T06:09:25","modified_gmt":"2026-10-17T06:09:25","slug":"sentieri-cai-carso","status":"publish","type":"page","link":"https:\/\/www.s1trail.com\/en\/sentieri-cai-carso\/","title":{"rendered":"The CAI trails of the Karst \u2014 the network behind the Corsa della Bora"},"content":{"rendered":"
\"S1<\/span>
\n

TRAIL NETWORK<\/span><\/p>\n\n\n

The CAI trails of the Karst \u2014 the network behind the Corsa della Bora<\/h1>\n\n\n\n

Trail numbers, official names and the 2027 races: the network of CAI trails on which the Corsa della Bora courses are built.<\/p>\n<\/div><\/div>\n\n\n\n

\n

The Trieste Karst is criss-crossed by a dense network of trails, numbered and maintained by the Club Alpino Italiano (CAI)<\/strong>, through its Trieste sections. Each trail is identified by a three-digit number (sometimes followed by a letter, e.g. CAI 001a<\/strong>) and marked on the ground with the classic white-red-white waymark<\/strong>, painted on trees, rocks and posts together with the trail number; at the main junctions, signposts show destinations and walking times. The official, up-to-date list of trails, with routes and technical data sheets, is published in the CAI FVG trail register \u2014 Sector 0 Karst<\/a>.<\/p>\n\n\n\n

The Corsa della Bora courses are largely built on this network, alternating stretches of CAI trail with short race-specific connecting sections<\/strong> \u2014 links with no CAI number, marked out at race time by the organisers with tape and dedicated signage. A trail never \u2018becomes\u2019 another one: the course joins it<\/strong>, leaves it<\/strong>, crosses it<\/strong> or follows it for a stretch<\/strong>, before continuing on a connecting section or a different trail.<\/p>\n\n\n\n

The CAI trails used by the 2027 races<\/h2>\n\n\n\n

The table lists the CAI trails in Sector 0 (Karst) covered by the Corsa della Bora 2027 distances, with the places they pass through and the races that use them. Only some trails have a proper name: where the CAI register does not give one, the trail is identified by its number alone.<\/p>\n\n\n\n

\n
CAI trail<\/th>Official name<\/th>Places along the trail<\/th>Races that use it<\/th><\/tr><\/thead>
CAI 001<\/td>\u2014<\/td>Crogole, Bottazzo\/Bota\u010d, Basovizza\/Bazovica, San Lorenzo\/Jezero, Obelisk of Opicina\/Op\u010dine, Bosco del Bovedo, Barcola\/Barkovlje, Miramare\u2013Contovello\/Kontovel, Aurisina Cave, Sistiana\u2013Duino\/Devin, Santa Croce\/Kri\u017e<\/td>S1 Trieste Ultra, S1 Bora Ultra, S1 TransKarst Ultra, S1 Family Hike & Trail, S1 Half Trail, S1 Borderless Trail<\/td><\/tr>\n
CAI 001a<\/td>Sentiero del Mitreo<\/td>Duino\/Devin, Mithraeum Cave (Mithraeum of Duino)<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Family Hike & Trail, S1 Half Trail, S1 Borderless Trail<\/td><\/tr>\n
CAI 003<\/td>Alta Via del Carso<\/td>Bosco Flondar, Casali Flondar, Jamiano\/Jamlje, cross-border sector of Monte Ermada\/Grmada, Grotta del Motore, Grotta D\u00f6rfler, Monte Sambuco\/Bezgonov vrh, return from the Slovenian border towards Precenico<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Half Trail, S1 Borderless Trail<\/td><\/tr>\n
CAI 003a<\/td>\u2014<\/td>Medeazza\/Medja vas, Case Coisce\/Kohi\u0161\u010de<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Half Trail, S1 Borderless Trail<\/td><\/tr>\n
CAI 008<\/td>\u2014<\/td>Duino Stazione (protohistoric settlement), Monte Ermada sector<\/td>S1 Family Hike & Trail, S1 Half Trail<\/td><\/tr>\n
CAI 009<\/td>\u2014<\/td>Miramare\u2013Contovello\/Kontovel<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 010<\/td>\u2014<\/td>San Pelagio\/\u0160empolaj, Prepotto, Fornace di Aurisina, Santa Croce\/Kri\u017e<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Borderless Trail<\/td><\/tr>\n
CAI 012<\/td>Sentiero Nicol\u00f2 Cobolli<\/td>Monte Gurca<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 015<\/td>\u2014<\/td>Hervati\/Hrvati, Val Rosandra\/Dolina Glin\u0161\u010dice<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 023<\/td>Sentiero Tiziana Weiss<\/td>Borgo San Mauro\u2013PortoPiccolo, Santa Croce\u2013PortoPiccolo<\/td>S1 Trieste Ultra, S1 Bora Ultra, S1 TransKarst Ultra, S1 Borderless Trail<\/td><\/tr>\n
CAI 032<\/td>\u2014<\/td>Precenico, San Pelagio\/\u0160empolaj<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Borderless Trail<\/td><\/tr>\n
CAI 033<\/td>\u2014<\/td>Duino\/Devin, Medeazza\/Medja vas, Visogliano\/Vi\u017eovlje<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Family Hike & Trail, S1 Half Trail, S1 Borderless Trail<\/td><\/tr>\n
CAI 035<\/td>\u2014<\/td>Fornace di Aurisina, Parco Lupinc<\/td>S1 Bora Ultra, S1 TransKarst Ultra, S1 Borderless Trail<\/td><\/tr>\n
CAI 039<\/td>\u2014<\/td>Between Val Rosandra and Bottazzo\/Bota\u010d<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 044<\/td>Sentiero Ressel<\/td>Basovizza\/Bazovica<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 046<\/td>\u2014<\/td>Bagnoli della Rosandra\/Boljunec, Crogole\/Kroglje<\/td>S1 Trieste Ultra, S1 Bora Ultra<\/td><\/tr>\n
CAI 075<\/td>\u2014<\/td>Jamiano\/Jamlje\u2013Issari\/Hi\u0161arji, the Bonetti\/Boneti area and Quota 208 Sud<\/td>S1 Bora Ultra, S1 TransKarst Ultra<\/td><\/tr>\n
CAI 079<\/td>Sentiero Abramo Schmid<\/td>Issari\/Hi\u0161arji, Monte Kremenjak, Quota 219\/\u0160pik, Italian\u2013Slovenian border area<\/td>S1 Bora Ultra, S1 TransKarst Ultra<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n

S1 Bora Ultra (116 km)<\/strong> links the two longest courses end to end \u2014 the S1 Trieste Ultra (61 km) for the first part and the S1 TransKarst Ultra (55 km) for the second \u2014 so it takes in practically every trail in the table except CAI 008, which is reserved for the Family and Half variants.<\/p>\n\n\n\n

Non-CAI routes crossed by the course<\/h2>\n\n\n\n

Along the way, the Corsa della Bora also crosses some of the area\u2019s best-known routes that are not part of the CAI numbering system<\/strong>: they are routes in their own right, with their own waymarking and their own history, and in places they simply run along the same path as the CAI trails listed above. They are not alternative names or synonyms for the CAI trails: sharing a stretch does not make two routes one and the same.<\/p>\n\n\n\n