Deep South Reef
Protected Area
Conception Island National Park
Why dive here
With 362+ marine species recorded in the area - including barracuda, blacktip reef sharks, dolphins, dwarf minke whales and humpback whales - Deep South Reef offers some of Long Island's richest reef diving. Water ranges 26-30°C, warmest August, September, October.
Deep South Reef definitely lives up to its name. You're looking at a deeper dive here, suited for advanced divers comfortable with potential currents. The main attraction is a healthy coral reef system, sloping down into the blue, where we’ve often spotted larger pelagics cruising past. If you're keen to explore beyond the usual shallow reef dives, this one delivers.
Reviews for Deep South Reef
Conditions
Ocean conditions, forecast and tides for Deep South Reef
Deep South Reef Ocean Conditions
Monthly averages for Deep South Reef, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (23.66, -74.95) (14km away)
October Averages
Sea Temperature
30°C
85°F · Range: 28–30.8°C
Current Speed
8.94 cm/s
Direction: NW (333.4°)
Chlorophyll-a
0.053 mg/m³
Very clear (oligotrophic)
Salinity
36.55 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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