Trail of the Kings™ – Lake Toba by UTMB® (Caldera Crown 100K)
Trail of the Kings™ – Lake Toba by UTMB®
Pangururan, Samosir Island
Race guide
Updated 19 July 2026
The Trail of the Kings™ – Lake Toba by UTMB® Caldera Crown 100K is a 101 km loop around Samosir Island, starting and finishing at Waterfront City Pangururan at roughly 908 m elevation. With 3,724 m of total climbing and a high point of 1,961 m, the course traces the volcanic caldera rim and interior ridges of one of the world's largest crater lakes, threading through highland villages and jungle singletrack in North Sumatra's equatorial heat. It is a race that rewards composure: the terrain never fully relents, the humidity is relentless, and the cut-offs — particularly the 22:00 checkpoint at Batu Hobon (80 km) and the 00:30 cut at AS8 (90 km) — leave little room for a mid-race crisis. Runners who treat the first 50 km as investment capital, not a free ride, are the ones who cash in on the back half.
Course & Terrain
The route begins at Waterfront City Pangururan (0 km, 908 m) and immediately places runners inside the distinctive geography of Samosir Island — a landmass sitting within the vast Lake Toba caldera. The course climbs into the island's interior highlands, passing through the crew-accessible checkpoint at Huta Tinggi (30 km, 1,301 m) before descending toward Sitao Tao (45 km, 1,241 m). From there the route pushes on to the Geopark Information Center (68 km, 1,234 m) and the critical Batu Hobon checkpoint (80 km, 1,264 m) before the final descent back to Pangururan at the finish. Terrain throughout is a mix of volcanic trail, jungle singletrack, highland farm tracks and village paths — surfaces that can shift between firm red earth and slick mud depending on recent rainfall. Technical descents demand attention at any hour of the day or night, and the remoteness between checkpoints means self-sufficiency matters.
The Decisive Climbs & Where the Race Is Won or Lost
Despite relatively moderate cumulative gain for a 100K — 3,724 m D+ — the climbs on this course carry outsized weight because they arrive in equatorial heat and at altitude bands where humidity does not ease. The high point at 1,961 m is not a brief summit; runners spend meaningful time on the exposed ridge sections approaching it, and a blow-up here translates directly into a missed cut-off at Batu Hobon (80 km, cut-off 22:00). That checkpoint is the race's defining gate: a runner arriving depleted with 21 km still to run faces both the 00:30 cut at AS8 (90 km) and the 09:00 finish cut in quick succession. The race is therefore effectively decided in the 45–80 km corridor — from Sitao Tao through to Batu Hobon. Runners who have banked patience through the first half arrive at this section with legs and heat tolerance intact; those who pressed early do not.
Pacing & Fuelling Strategy
The single most important strategic principle on this course is patience in the first 50 km. The early kilometres out of Pangururan and through to Huta Tinggi (30 km) can feel open and inviting — that is the trap. Treating the first half as a social, even conversational effort is not a concession; it is the deposit that funds a strong close. A deliberate, unhurried approach to Sitao Tao (45 km) means arriving at the back half of the race with genuine capacity. From Batu Hobon onward, break the remaining distance into small, manageable segments rather than fixating on the full gap to the finish — two checkpoints, two resets, manageable increments. On fuelling: with crew access at four points (30 km, 45 km, 68 km, 80 km), runners should use each crew meeting as a structured reset — food, fluids, a brief but deliberate stop — rather than a hurried pass-through. In equatorial conditions, sodium and hydration management between Sitao Tao and the Geopark Information Center (a 23 km gap without a crew point) is particularly critical.
Conditions to Expect
Samosir Island sits on the equator at altitude, which produces a distinctive weather profile: warm to hot temperatures during daylight hours, genuine humidity at every elevation band, and the ever-present possibility of heavy rain that turns trail surfaces slick without warning. Runners should expect to race through at least one full night — the cut-off structure places most runners at Batu Hobon (80 km) around or after nightfall, with the final 21 km run in darkness before the 09:00 finish cut. Night sections on volcanic singletrack demand reliable lighting and knowledge that descents which felt manageable in daylight become genuinely technical after dark. Sun protection, hydration discipline during the daylight hours and a mental readiness for the humidity are non-negotiable preparation items. The caldera landscape is exposed on the upper ridges and sheltered — and hot — in the valley and jungle sections; neither offers relief from the equatorial climate, only different versions of it.
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Checkpoints & cut-offs
✓ Course data verified against the official source (2026-07-05) · official source
0 km · 906 m · Sat 03:00
9.2 km · 1187 m · —
21 km · 1525 m · —
34 km · 1187 m · —
45.7 km · 1240 m · —
50.2 km · 1960 m · —
57.1 km · 1240 m · —
63.1 km · 1110 m · Sat 22:00
71.1 km · 1054 m · Sun 00:30
83.2 km · 907 m · —
93.9 km · 1006 m · —
102.1 km · 905 m · Sun 09:00
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