Green Bush (Mentawai & Betumonga (West Sumatra Coast))

Green Bush is a remote, exposed left-hand reef break in the Mentawai Islands, surfed almost exclusively by boat. The wave is widely described as hollow, fast, and powerful—one of the defining barrel destinations for experienced riders—breaking over an extremely sharp coral/reef bottom. The core challenge is safety: the reef is very shallow and sharp, with strong currents and sweep along the reef. Multiple sources emphasize that mid and low tides can make the reef dangerously shallow, turning wipeouts into a serious risk. As a result, timing (often mid to high tide) is a critical part of setting up the session, and the shallow sections demand careful paddling/outflow choices as the tide changes. From a performance perspective, the wave is characterized by mechanical consistency and a barrel that can hold significant size. Optimal swell is described as West to Southwest, with left-hand barrel geometry and fast peel from a hollow shape. Typical rides are described as short but intense, with better days extending to longer barrel-and-shoulder sections. Seasonally, conditions are most favorable during the main swell window—commonly described as May through September (with additional best-window months in the broader April to October range). Crowd levels are generally reported as empty/quiet most of the time, though it can become more active with peak-season advanced visitors. Wind is described as working best with an East/NE regime to create cleaner/offshore grooming for the barrel face.