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Red Lake (Imotski)
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Lake
Red Lake (Crveno jezero) near Imotski is globally recognized as one of the deepest water-filled karst sinkholes, offering a wide-open display of geological forces. The total depth of the sinkhole from the surrounding rim to the very bottom is approximately 530 meters, with the water column itself often exceeding 280 meters in depth. It derives its name from the distinctive reddish-brown color of the surrounding limestone cliffs, which are tinted by iron oxides present in the rock. As the bottom of the lake lies below sea level, it is categorized as a cryptodepression, making it a site of significant interest for hydrogeological research. Due to the nearly vertical and dangerous cliffs, the lake is inaccessible to the general public, though it can be viewed from a safe observation platform on the rim. Scientific explorations have identified unique endemic species such as the Imotski gudgeon (Delminichthys adspersus) living within its depths. The sinkhole was likely formed by the collapse of an enormous underground cavern system triggered by tectonic movements.
- Location: Croatia
- Top sights: Ilirska gomila (Illyrian stone pile) · Viewpoint Modro Jezero · Tvrđava Topana
- Nearby: Grubine (4 km)
Best time to visit & climate
The most pleasant time to visit is Jun–Aug.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 3 | 4 | 7 | 11 | 15 | 20 | 24 | 24 | 18 | 13 | 9 | 4 |
| Rain mm | 93 | 88 | 80 | 68 | 57 | 50 | 28 | 38 | 80 | 87 | 123 | 117 |
📋 Practical info
Getting there
The lake is easily reached via clearly marked paved roads leading directly from the nearby town of Imotski. An observation deck is situated conveniently close to the road for immediate dramatic viewing.
Best season
It can be comfortably visited year-round, though spring and early summer offer optimal lighting to appreciate the reddish cliffs. Avoid visiting during heavy rainstorms when visibility significantly drops.
Terrain & paths
The viewing areas are mostly flat and fully paved, suitable for all standard types of visitors. Accessing the water level itself is impossible for regular tourists due to the extreme, sheer vertical drop.
What to bring
Everyday comfortable casual walking shoes are completely adequate for the paved observation points. Carrying a camera with a wide-angle lens is strongly recommended to capture the immense scale of the sinkhole.
Parking
Dedicated parking spaces are generally available directly adjacent to the main viewing platforms. During peak summer tourist seasons, these limited spots can fill quickly, so arriving somewhat early is helpful.
Safety
Visitors must strictly remain safely behind all constructed guardrails and designated barriers. Never attempt to throw heavy objects down or climb the precarious surrounding cliffs, as it is extremely dangerous.
Time needed
A typical stop for viewing and photographing the immense sinkhole takes about half an hour to an hour. Most tourists combine this short, spectacular visit with the nearby Blue Lake for a longer trip.
Geography
Facts
- The total depth of the sinkhole reaches a staggering 530 meters.
- Maximum water depth has been measured at approximately 287 meters.
- The bottom of the lake is 6 meters below sea level (cryptodepression).
- Reddish cliff colors are caused by a high concentration of iron oxides.
- It is home to the endemic spotted minnow (Delminichthys adspersus).
- It is one of the largest and deepest karst sinkholes on Earth.
Explore nearby
Notable places around
Route planner — Car & Motorhome
Where do you start? We build the route here, with stops and country notes along the way.
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© OpenStreetMap contributors · OpenRouteService
Sights in the town Red Lake (Imotski) (5)
Zavičajni muzej Imotski🏛 museum
Regional museum in Imotski with exhibits on local history and culture.
Sights nearby
Frequently asked questions
Can you swim in the Red Lake?
No, the lake is inaccessible due to the nearly vertical, 240-meter-high cliffs.
Why is it called the Red Lake?
The name comes from the reddish color of the surrounding cliffs, not the water itself.
How deep is the Red Lake?
It is one of the deepest water-filled sinkholes in the world, with a total depth of over 500 meters.
Can you throw a stone into the lake?
It is very difficult to hit the water with a stone from the top due to air currents.
How was the lake formed?
It was formed by the collapse of a huge underground cave.
Red Lake (Imotski): where is it located?
Red Lake (Imotski) is located in Croatia.
Red Lake (Imotski): what is there to see?
Highlights include Ilirska gomila (Illyrian stone pile), Viewpoint Modro Jezero, Tvrđava Topana.
Red Lake (Imotski): when is the best time to visit?
The most pleasant time to visit is Jun, Aug.
Red Lake (Imotski): why is it worth visiting?
Red Lake (Crveno jezero) near Imotski is globally recognized as one of the deepest water-filled karst sinkholes, offering a wide-open display of geological forces.
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