Surfing Cobblestones: The Complete Guide

Cobblestones is a reef break located in East Sumbawa, Indonesia, offering both lefts and rights along Southeast Asia's tropical lineups. Cobblestones is a small channel break near Lakey Peak in East Sumbawa, offering both lefts and rights on a compact reef. Rated as intermediate difficulty with lightly crowded conditions, this reef break is a worthy destination for surfers looking beyond the usual suspects.

Best Conditions

Swell Direction: The ideal swell direction is SW (215°), with workable conditions from SSW to SW (200°–230°). Swells outside this window will either miss the break or produce disorganized waves.

Swell Size: Cobblestones needs a minimum of 0.9m / 3ft to start working and handles swells up to 1.8m / 6ft before conditions deteriorate.

Swell Period: Look for a swell period of at least 10 seconds, with 14 seconds being the sweet spot. Longer periods deliver more organized, powerful waves with better shape.

Wind: True offshore here blows from the E (90°). The full offshore range spans ENE to ESE (60°–120°). Glassy conditions under 4km/h from any direction also produce excellent surf. Plan for early morning dawn patrol sessions.

Tide: This spot works best at mid tide. Optimal tide range is 0.5m–1.5m.

When to Go

Primary Season: The prime window at Cobblestones runs April, May, June, July, August, September, October (Apr–Oct). This is when swell consistency and direction align most reliably with the break.

Secondary Season: A secondary window opens November, December, January, February, March (Nov–Mar). While not as consistent, patient surfers can still score quality sessions during this period.

Season Notes: Best Apr-Oct (dry season, SE trades offshore). Swells year-round but wet season brings onshore winds.

Water Temperature: Expect water temperatures around 28°C / 82°F. Boardshorts or a thin rashguard are all you need.

Getting There

The nearest airport is BMU, roughly 30 minutes by car.

Hazards & Tips

Known Hazards:

🪸 Sharp reef — Shallow reef, booties recommended

Safety Tips:

Wear reef booties to protect your feet from sharp coral and rock

Skill Level: This spot is rated intermediate (5/10). Crowd Level: Typically lightly crowded (4/10).

Check the Live Forecast

Planning a session at Cobblestones? Check the live forecast on Strike Mission to see today's conditions and the 10-day outlook. Our Strike Score algorithm rates this spot from 0 to 100 every day, factoring in swell direction, size, period, wind, and tide — so you know exactly when to paddle out.

Don't leave your next surf trip to chance. Let the data tell you when Cobblestones is firing.

*Conditions data sourced from Strike Mission's verified spot database.*