Thailand

Thailand may be famous for its beaches, but its northern highlands hide a serious playground for climbers. With four catalogued climbs on offer, the country delivers gradients that surprise riders expecting easy tropical spinning. Two of these ascents earn the fearsome hors catégorie label, the toughest classification a road can carry, and the highest of them all crests at 2560 metres above the humid lowlands. Doi Inthanon anchors the collection, a relentless drag toward the summit that tests legs and patience in equal measure.

Beyond the marquee giant, the climbing here is beautifully varied. Doi Ang Khang and Doi Suthep offer their own distinct character, from long steady pitches to sharper, punchier ramps, while Phu Nam Ron rounds out the quartet. Together they make Thailand a genuine destination for cyclists chasing altitude, elevation gain, and the quiet satisfaction of conquering a high-summit road far from the crowds.