Hans Reef
Hans Reef is a dive site in Lombok, Indonesia. It lies within the Gili Ayer, Gili Meno, Gili Trawangan Marine Recreation Park. Currents typically run at 1.7 km/h and reach 3.2 km/h on the strongest days. Water temperatures range from 28°C in August to 30°C in November. The typical daily tidal range is about 1.2 m. Species recorded in the area include Green Sea Turtle, Clark's Anemonefish, Saddle Butterflyfish, Common Egg Cowry and Brown Tang.
Dive Conditions
Data sources: currents and water temperature from Open-Meteo Marine (CC BY 4.0), hourly model values 2024. Tidal range is the median daily range of modelled sea level from Open-Meteo Marine, hourly values 2024. Protected area boundary from OpenStreetMap contributors (ODbL). Species observations from iNaturalist, checked against the World Register of Marine Species.
Conditions at Hans Reef through the year
Sea surface temperature at the site coordinates, averaged per month from hourly model values for 2024. The water is warmest in November at about 30 °C and coolest in August at about 28 °C, a spread of 2 degrees across the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 29.4 | 29.4 | 29.6 | 30.1 | 29.8 | 29.1 | 28.8 | 28.3 | 28.6 | 29.4 | 30.3 | 29.9 |
Ocean current at the site runs at a typical 1.7 km/h. In the strongest tenth of the hours modelled for 2024 it reaches 3.2 km/h, which is when entries are normally timed to slack water at the turn of the tide.
The tide moves the water level by a median 1.2 m over a day, and by up to 1.7 m on the largest days of the month. That range drives how much water is exchanged over the reef and when the current turns.
Offshore wave statistics are not shown for Hans Reef: within 10 km of the site there is land in the directions from which 77 % of the larger waves in the area arrive, so open-sea values would overstate the swell at the site itself.
Hans Reef lies inside Gili Ayer, Gili Meno, Gili Trawangan Marine Recreation Park. Protected areas can carry their own rules on entry fees, permits, anchoring and fishing; check the current rules with a local operator before you dive.
How Hans Reef compares
These comparisons use only the measured values above, set against the 376 dive sites published on findadive.com. A percentage shows the share of other sites with a lower (or higher) value, so it reads the same way wherever the site is.
| Measure | This site | Compared with all sites | Median in Lombok |
|---|---|---|---|
| Mean water temperature | 29.4 °C | cooler than 53 % of the other 375 sites | 29.4 °C (44 sites) |
| Water temperature in the coolest month | 28.3 °C | warmer than 62 % of the other 375 sites | 28.2 °C (44 sites) |
| Typical current | 1.7 km/h | stronger than 58 % of the other 375 sites | 1.8 km/h (44 sites) |
| Current in the strongest 10 % of hours | 3.2 km/h | stronger than 61 % of the other 375 sites | 3.2 km/h (44 sites) |
| Median daily tidal range | 1.2 m | smaller than 81 % of the other 375 sites | 1.2 m (44 sites) |
Water temperature, current and tide from Open-Meteo Marine (CC BY 4.0), hourly model values for 2024 at -8.3461°, 116.0908°. Protected area boundary from OpenStreetMap contributors (ODbL). Wave statistics from ERA5-Ocean via Open-Meteo Marine (contains modified Copernicus Climate Change Service information 2015–2024), daily maximum wave height on a 0.5° grid; land shelter tested against Natural Earth coastlines.
Marine life recorded at this site
Research-grade observations from iNaturalist within about 12 km of these coordinates.
