Blue Lake

Blue Lake (Modro jezero) is a karst lake right on the edge of Imotski, in the Dalmatian hinterland, and one of the most distinctive natural sights in the region. It formed inside a massive karst sinkhole, most likely after the collapse of an underground cave system, and together with the neighboring Red Lake (Crveno jezero) it forms a striking pair of natural landmarks that draw travelers exploring Dalmatia beyond the coast.

How do you get to Blue Lake?

The lake sits right at the edge of the town of Imotski, so reaching it doesn't require a long trip — a walk from the town center is enough. A roughly 1,100-meter path, built back in the 19th century, leads down to the water's edge, making access much easier than the raw sinkhole terrain would otherwise allow. Admission to both Blue Lake and Red Lake costs around 5 euros per adult, and it's worth setting aside extra time, since Red Lake is only about 1.5 km away and pairs naturally into the same visit.

What will you see there?

Blue Lake occupies a sinkhole roughly 800 by 400 meters wide, with a total depth from the upper rim of around 220 meters. The water level, though, changes dramatically over the course of the year. In spring, as snow melts from the surrounding mountains, the lake can fill to a depth of about 90 meters, and in a record year, 1914, the water rose to 114 meters and spilled over the southern rim. By late summer the picture is often the opposite — the lake can dry up almost completely, exposing its rocky floor. That's exactly when locals take advantage of the dry bed to play football matches on it, one of the quirky local traditions worth knowing about before a visit. On a rocky outcrop looming above the lake stand the ruins of the medieval Topana fortress, offering sweeping views over Blue Lake and the surrounding countryside.

When is the best time to visit?

Spring and early summer are the best times to come, when the water level is at its highest and the landscape around the lake is at its greenest. That's when the lake looks its most striking, with deep blue water contrasting against the pale rock walls of the sinkhole. By late summer and early autumn, expect the water level to be very low or the lake to be dry altogether — worth factoring in if swimming, rather than just the view, is the main goal.

Can you swim in Blue Lake?

Yes, whenever the water level allows it, the lake's cool water is a popular spot for a swim on hot days. It's one of the few places in the region to swim in water of karst origin, ringed by tall rock walls instead of a typical Dalmatian beach.

Frequently asked questions

How much does it cost to visit Blue Lake? Admission to both Blue Lake and Red Lake costs around 5 euros for an adult.

How far is Red Lake from Blue Lake? Red Lake sits about 1.5 km from Blue Lake, so the two are easy to combine into a single outing.

Does the lake always have water? No — the water level depends heavily on the season. It's usually highest in spring and can drop almost to nothing by the end of summer.

What else is worth seeing nearby? The ruins of the medieval Topana fortress overlook the lake, offering views across Blue Lake and the hills around Imotski.