Skip to content
Map of Great Basses Reef (Coin Wreck)
Add the first photo
AdvancedBoat entry

Great Basses Reef (Coin Wreck)

Kirinda, Sri Lanka
20 m (66 ft) depthBoat entryRash guard or 2mm shorty typical

Boat dive — see Entry & access.

Great Basses Reef (Coin Wreck) at a glance

Great Basses Reef (Coin Wreck) is an advanced boat dive site in Kirinda, Sri Lanka with depths of up to 20 m (66 ft). Typically most favorable Mar · from 3 years of archive data. Recent reports put the water around 29°C (85°F). Check the latest conditions and entry details before you go.

Moderate window now· until 15:00, then favorable until 18:00 · sunset 17:46

Forecast for this hour · 13:00 · run 14 h ago
1.6 m (5.3 ft)waves — about a meter and a half expected (waves — about five feet expected)

Tap a factor for its source and model point · Forecast 29°C · seasonal avg 29°C ( · Forecast 85°F · seasonal avg 84°F)

Site hazards: Strong current and surge sweep divers toward the reef top, and the hazard increases as depth decreases toward the shallows. The site is only accessible from mid-March through the end of April, the window between the North-East and South-West monsoons; conditions turn hazardous outside that window. Only experienced divers comfortable with current and surge should attempt this site. The open-water boat transit (roughly 1-1.25 hrs each way) exposes divers to swell before the dive even begins.

Read the full hazards ↓

Dive windows this week

Sun11:00–15:00 moderate, 15:00–18:00 favorable

1.6 m waves · 11 kn wind (5.2 ft waves · 11 kn wind)

Mon6:00–9:00 favorable, 9:00–13:00 moderate, 14:00–17:00 moderate, 17:00–18:00 favorable

1.7 m waves · 14 kn wind (5.5 ft waves · 14 kn wind)

Tue6:00–10:00 favorable, 10:00–14:00 moderate, 14:00–15:00 favorable, 15:00–16:00 moderate, 16:00–18:00 favorable

1.6 m waves · 13 kn wind (5.4 ft waves · 13 kn wind)

Wed6:00–7:00 favorable, 7:00–8:00 moderate, 8:00–10:00 favorable, 10:00–18:00 moderate

1.6 m waves · 14 kn wind (5.2 ft waves · 14 kn wind)

Thu6:00–12:00 favorable, 12:00–18:00 moderate

1.5 m waves · 11 kn wind (4.8 ft waves · 11 kn wind)

Fri6:00–18:00 favorable

1.3 m waves · 8 kn wind (4.1 ft waves · 8 kn wind)

SatNot in the forecast yet

Favorable windowModerate window— no window

Every forecast dive window each day, site-local time, from wave and wind forecasts. Numbers under each bar are daylight averages.

First light 5:28 · Sunrise 5:50 · Sunset 17:46 · some windows run past sunset

Source: Open-Meteo marine · model point 4.0 km from site · updated 24 Oct, 22:47 GMT+5:30

Forecast only — always assess conditions on site.

Compare this weekend’s windows near Great Basses Reef (Coin Wreck)

Recent diver reports

Dated firsthand observations from divers — not current conditions.

No diver reports for this site yet. — one dated observation helps every diver after you.

Dived here today — did the forecast match?

Best months, historically

What conditions have historically been typical at this site, month by month — not a forecast.

  1. January, 28% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 1.6 m (5.1 ft), wind has typically been 19 knots
  2. February, 38% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.5 m (4.9 ft), wind has typically been 18 knots
  3. March, 76% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 1.3 m (4.4 ft), wind has typically been 13 knots, historically most favorable
  4. April, 61% of days have historically been favorable, water has typically been 30°C (86°F), waves have typically been 1.5 m (5.0 ft), wind has typically been 12 knots
  5. May, 17% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 2.0 m (6.7 ft), wind has typically been 19 knots
  6. June, 0% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 2.2 m (7.2 ft), wind has typically been 22 knots
  7. July, 0% of days have historically been favorable, water has typically been 27°C (81°F), waves have typically been 2.2 m (7.2 ft), wind has typically been 22 knots
  8. August, 0% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 2.2 m (7.2 ft), wind has typically been 21 knots
  9. September, 1% of days have historically been favorable, water has typically been 28°C (82°F), waves have typically been 2.1 m (7.0 ft), wind has typically been 22 knots
  10. October, 20% of days have historically been favorable, water has typically been 29°C (84°F), waves have typically been 1.8 m (6.0 ft), wind has typically been 16 knots
  11. November, 64% of days have historically been favorable, water has typically been 29°C (85°F), waves have typically been 1.6 m (5.1 ft), wind has typically been 14 knots
  12. December, 45% of days have historically been favorable, water has typically been 28°C (83°F), waves have typically been 1.5 m (5.0 ft), wind has typically been 16 knots

March has typically had the largest share of favorable days here. Conditions vary year to year — this is historical context, not a forecast.

Based on 3 years of archive data. Bar height shows the share of days each month whose conditions have historically scored favorably.

Marine life recorded at this site

No recorded sightings data for this site yet. Species lists appear as GBIF records and diver reports accumulate.

Fills & rentals nearby

No dive shops mapped within 25 km (16 mi). Know one? Add it to the map.

Data updated June 2026

Site details

No description for this site yet — divers who know it can suggest one below.

boatdriftreefwreck

Strong current and surge sweep divers toward the reef top, and the hazard increases as depth decreases toward the shallows. The site is only accessible from mid-March through the end of April, the window between the North-East and South-West monsoons; conditions turn hazardous outside that window. Only experienced divers comfortable with current and surge should attempt this site. The open-water boat transit (roughly 1-1.25 hrs each way) exposes divers to swell before the dive even begins.

Reviews

No reviews yet — this site is waiting for its first. Dived here? Your rating and a few lines help the next diver.

Spot something off?

Help keep this listing accurate for the next diver.