The Reef – Batu Karas
Karang · Batu Karas, West Java, Indonesia · Reef break
Local time — · Sunrise 05:18 · Sunset 17:44
Reading the ocean.
SWELLRADAR is requesting a verified marine run for The Reef – Batu Karas.
Spot intelligence.
The retained Reef marker represents Karang/BK Reef by Villa Monyet, not the sandy Legok Pari learner point or a generic beach peak. Sally Arnold's original report grades this faster right for advanced surfers, whereas the specialist table says Intermediate. Advanced is the conservative independent-recommendation gate, not permission in heavy surf or a transfer of the main point's learner reputation.
Profile source · Surf Indonesia · original Batu Karas guide, Karang rowsProfile sources & limits
Reviewed 23 Oct 2026 · not observation-validated
Published sources reviewed by SWELLRADAR, not validation against measured breaking waves. Swell and independently stated wind references are qualitative ranking inputs, not surveyed optima, measured shelter or full acceptance windows. The inherited generic 0.6–3.0 m offshore-model ranking band remains unchanged and unvalidated: not a measured local working range, safe learner range or wave-face conversion. Original approximate map pins and location sources remain. Explicit six-kilometre sea requests do not survey reefs, channels, currents, access or provider-snapped cells. Surf Indonesia distinguishes Karang from BK Point and supplies reef-specific S swell and independently stated WNW wind; its neighbouring point's SSW wind entry is not transferred. Sally Arnold's original on-site Travelfish report independently places the fast reef right in front of Villa Monyet and favours experienced surfers and high water. Atlas also describes a right-dominant A-frame with a left option and low-water reef exposure, so no exclusive-right assertion or surveyed takeoff boundary is made. Regional dry-season commentary and learner claims belong to other sections, not this reef. Higher-water advice does not establish a normalized optimum, safe depth or motion reward; no tide bonus, preferred window or adaptive fallback is added.
- Surf Indonesia · original Batu Karas guide, Karang rows
Separates Karang/BK Reef from the sandy point, faster right and shallow reef, reef-specific S swell and independent WNW wind; numeric ride lengths and optimum heights are not calibrated
- Travelfish · Sally Arnold's original Batu Karas field report
Original dated visitor report places Karang's fast reef right by Villa Monyet, grades it advanced and favours high water; historical lessons/prices are not adopted
- Surf Atlas · Joseph Richard Francis's original Batu Karas guide
The separate Reef section describes exposed low-water reef, A-frame walls and dominant faster right, distinct from the sheltered learner point; regional seasonal claims are not reef-specific calibration
Source-informed axes
Swell axis S · 180°
Offshore wind from WNW · Advanced profile
Wave
Predominantly right · faster reef walls
Reef · exposed rock at lower water
Swell window
S · qualitative Karang reef reference
0.6–3.0 m offshore ranking band
Clean wind
WNW · qualitative Karang guide reference
Applied to wind scoring
Tide window
Higher-water reef advice · unverified scoring
No tide phase affects scoring
Field guide
Read the break.
Character · setup · local read
Field guide
Read the break.
Character
01The Reef – Batu Karas is defined by predominantly right · faster reef walls over reef · exposed rock at lower water. The shape can change with swell angle, period and the active section, so the live score should always be paired with a visual check from shore.
Best setup
02S · qualitative Karang reef reference swell, wnw · qualitative karang guide reference and higher-water reef advice · unverified scoring form the profile baseline. SWELLRADAR retains 0.6–3.0 m as an offshore-model ranking band, not a measured local surf limit or a breaking-wave prediction.
Lineup read
03This is an advanced profile: positioning, entry and exit should be assessed before committing. Pay particular attention to shallow reef exposed at lower water, fast walls and hollow sections, crowded reef takeoff. Local signs and advice always take priority.
Know before you paddle
Live conditions and local advice always override this profile.
Optional community layerRecent surfer reportsVoluntary and potentially incomplete. Not used for the forecast or Surf Score.
The break
Reef break
Advanced. Works best with S · qualitative Karang reef reference swell.
Timing
WNW · qualitative Karang guide reference
Higher-water reef advice · unverified scoring. Re-check local observations and the lineup before you paddle out.
Data note
Model data unavailable
SWELLRADAR withholds numerical conditions, scores and surf windows until a quality-checked marine forecast is available.