How Lance's Right (HTs) Works
Mentawai Islands, Indonesia · part of the Lance's Right (HTs) spot guide
Lance’s Right — Hollow Trees, or HTs — is widely rated one of the most perfect right-hand reef barrels on Earth, breaking over a coral-covered lava slab at the southern tip of Sipora in the Mentawai Islands. South-to-southwest groundswell refracts hard around the point and unloads almost due south, standing into a consistent, hollow, high-line right with long open walls between the tube sections.
| Zone | Approx. depth | What happens here |
|---|---|---|
| Takeoff / The Office | 8–12 ft | The outer takeoff where groundswell trips on the slab edge — a quick, steep drop into the marquee barrel |
| Barrel throat | 5–8 ft | The slab steepens and the wave stands up and throws |
| Main wall | 4–6 ft | Shallowing, hollow and fast along the peel |
| Surgeon’s Table (inside) | 1–4 ft | The flat, sharp coral shelf — near-dry on low tide and the injury zone |
The wrap is the whole story: swell bends roughly 180° around the southern point of Sipora, and that refraction focuses and amplifies its energy onto the slab. On smaller swells the sections — The Office, the main wall, the inside Surgeon’s Table — break as separate pieces with channels between them; only a solid swell around six feet and up connects them into one long ride of well over 100 yards.
It is shallow and sharp, and the inside shelf is named for how often it grazes surfers who get caught there. There is no buoy within roughly 1,900 km, so HTs is forecast off models, and the heights here are open-ocean readings, not the breaking face.
Lance's Right (HTs) wave mechanics — FAQ
Why is Hollow Trees such a perfect barrel if the reef faces west but the wave breaks south?
Because south-to-southwest Indian Ocean groundswell refracts nearly 180° around the southern point of Sipora, focusing and amplifying its energy onto the lava-and-coral slab. That wrap stands the swell into a consistent, hollow, high-line right that links up on a solid long-period pulse.
When should I go?
The dry season, April to October, core May to September — the most consistent southwest groundswell and the most light-offshore mornings. August is a global best bet. It is rideable most of the year thanks to Mentawai consistency, but off-season is smaller and windier.
How dangerous is it?
Serious. It is shallow and sharp — the inside shelf is meanest at low tide — with heavy crowds, charter-boat traffic and remote access hours from real medical care. Intermediate-to-advanced minimum, low tide is expert-only, and reef booties and a first-aid kit are smart.