Red Lake is a unique karst phenomena. Originally, it used to be an underground lake, but when the ceilings had collapsed, it came to the surface. The 200 m high cliffs are rising above the lake. The water is red due to the high concentration of iron oxide. At some parts, the lake can be even 300 m deep, and it is not possible to access the water.
Blue Lake was also originally an underground lake. It is situated on a 200 m deep sink hole, which by its shape reminds us of a funnel. The depth of the lake ranges between 20 and 90 m. Sometimes, the lake can even dry out, and so it is is possible to get to the water. Red and Blue Lakes are popular tourist destinations from the Makarska Riviera.