Puglia by UTMB
Puglia by UTMB – Castellaneta Underground Trail
Castellaneta → Castellaneta Marina
Race guide
Updated 18 July 2026
The Castellaneta Underground Trail is the 50 km option at Puglia by UTMB, running from the hill town of Castellaneta down to the Ionian coast at Castellaneta Marina. With 829 m of climbing over 50 km and a high point of just 299 m, this is a fast, runnable ultra by trail standards, defined less by vertical gain than by the steady loss of altitude as the course drops from 228 m at the start to 6 m at the finish by the sea. For a first ultra or a hard tempo effort, this is an inviting profile: no alpine passes, no technical high mountains, and a course that rewards runners who can hold a rhythm. The challenge is the opposite of a mountain race — keeping the legs turning over on gently descending and rolling terrain for five-plus hours, and respecting the four cut-offs that tighten as you approach the coast.
The course: from Castellaneta to the sea
The route is point-to-point, starting in Castellaneta at 228 m and finishing 50 km later at Castellaneta Marina at 6 m, essentially at sea level. Four intermediate points structure the day: Grotte di Sileno at 16.1 km (134 m), Relais San Giovanni at 27.7 km (97 m), Nafoura at 40.7 km (28 m), and the seaside finish at 50 km. The overall trend is downhill, but the modest 829 m of total climb tells you the profile rolls rather than plunges — you lose altitude in steps, with short reclaims between the drops. Because the high point is only 299 m, expect Mediterranean terrain rather than mountain trail: the gravine (ravines) and low ridges of the Castellaneta area, farm and forest tracks, and the coastal pine belt near the Marina. This is a course to run, not hike. The single biggest tactical fact is that the fast, flat closing kilometres come when you are most tired, so banking effort sensibly in the first half matters more than attacking any one climb.
Where the race is decided
There is no signature mountain climb here, so the race is won or lost on pacing discipline rather than on a single decisive ascent. The steepest net loss comes early: from the 228 m start down toward Grotte di Sileno at 134 m by 16 km, a section where it is easy to run far too hard on ground that flatters your splits. Go out controlled here and you will still have legs for the second half. The most demanding stretch mentally is the run-in from Nafoura (28 m at 40.7 km) to Castellaneta Marina, the final 9.3 km along the coastal flats near sea level. With almost no elevation left to give, this is flat, exposed running where fatigue — not terrain — sets your pace. Runners who kept something in reserve through Relais San Giovanni and Nafoura are the ones who close strong; those who spent everything on the early descents grind it out.
Pacing and fuelling with the cut-offs
The aid and control points fall at 16.1 km, 27.7 km, 40.7 km and the finish, so plan to carry fluid for the longest leg — the opening 16.1 km to Grotte di Sileno — which is the biggest single gap on course. After that the spacing tightens to roughly 11.6 km (to Relais San Giovanni), 13 km (to Nafoura), and 9.3 km home, all manageable carries. The cut-offs step down through the day: Grotte di Sileno by Sun 10:15, Relais San Giovanni by 12:20, Nafoura by 14:30, and Castellaneta Marina by 16:30. These give a generous but not unlimited window, so treat the mid-race controls as hard checkpoints and keep aid stops brisk. Fuel steadily from early — the runnable profile means you will be moving continuously and burning through carbohydrate faster than a climb-heavy race where you would be hiking. Grotte di Sileno and Nafoura are crew points, so stage bottles, food and a change of essentials there if you have support.
Conditions to expect
Puglia sits on the sun-baked heel of Italy, and this course spends its entire length at low altitude, dropping to the coast. Heat and sun exposure are the conditions to prepare for rather than cold or altitude — there is no high ground to bring relief, and the closing kilometres near Castellaneta Marina run through open, low-lying terrain by the sea. Carry more fluid than the aid spacing alone suggests if the day is warm, and rehearse your electrolyte plan. The terrain around the gravine of Castellaneta can be dry, dusty and firm underfoot, with the coastal pinewood offering some shade near the finish. Because the course finishes at 6 m by the Ionian sea, humidity can build as you descend. Plan sun protection, start hydration early rather than chasing it late, and expect the temperature to feel hottest exactly where the profile flattens out for the run to the Marina.
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Checkpoints & cut-offs
✓ Course data verified against the official source (2026-07-17) · official source
0 km · 228 m · —
16.1 km · 134 m · Sun 10:15
27.7 km · 97 m · Sun 12:20
40.7 km · 28 m · Sun 14:30
50 km · 6 m · Sun 16:30
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