Spot Guide · Sumbawa
Kertasari is a catalogued surf break in Sumbawa. This baseline guide uses a regional estimate for the typical reef break, seasonal swell exposure, and lineup risk; confirm conditions locally before paddling out.
Ombak Surf research review · September 2026 · 2 sources
Conditions
Modelled swell, wind, tide, and a seven-day outlook. This is a forecast, not a live observation at the reef.
Kertasari is a catalogued surf break in Sumbawa. This baseline guide uses a regional estimate for the typical reef break, seasonal swell exposure, and lineup risk; confirm conditions locally before paddling out.
Reef, Currents. Respect the pecking order and give way to locals who surf here daily. See our surf etiquette guide →
This guide combines spot-specific research and clearly labelled regional context. Conditions, access, and hazards can change; confirm locally before a session.