Blue Grotto | Herceg Novi

The Blue Grotto, known locally as Plava Špilja, is a natural sea cave located on the Luštica Peninsula at the entrance of the Boka Kotorska. It is characterized by the blue luminescence created as sunlight reflects off the sandy seafloor through an underwater opening.

Visual Characteristics

The cave features a vaulted ceiling reaching heights of 9 meters and a maximum water depth of approximately 5 meters. The interior rock consists of porous karst limestone in shades of grey and beige, while the water appears intense turquoise or indigo depending on external light intensity. Two distinct entrances allow for the passage of small maritime vessels.

Location & Access Logistics

The site is accessible only by sea. Regularly scheduled boat tours depart from the Herceg Novi harbor (Gradska Luka) and Igalo beach, covering a distance of approximately 9 nautical miles. Private water taxis also operate from the nearby Rose and Žanjic beaches, which are accessible by road from the main Luštica Peninsula route.

Historical & Ecological Origin

The grotto is a geomorphological feature formed through millennia of wave erosion against the limestone cliffs of the Adriatic coast. It is classified as a sea cave within the Dinaric Karst system, a geological formation prevalent along the Montenegrin littoral.

Key Highlights & Activities

Swimming and snorkeling within the cave are the primary activities. Small tourist boats enter the cavern to allow passengers to observe the light refraction. Diving is possible, though visibility is highest near the cave entrances where natural light is most abundant.

Infrastructure & Amenities

There is no physical infrastructure, restrooms, or shade structures inside or immediately adjacent to the cave. Cell phone signal (4G) is inconsistent due to the high limestone walls. Food and beverage services are located 2 kilometers away at Žanjic and Mirišta beaches.

Best Time to Visit

The optimal window for the blue light effect is between 11:00 AM and 2:00 PM when the sun is at its zenith. The cave is only accessible during calm sea conditions; southern winds (Jugo) create heavy swells that make entry hazardous. The peak season runs from June through September.

Facts & Legends

The intensity of the blue color is caused by a phenomenon where the water filters out red light, allowing only the blue spectrum to reflect back to the surface. Local fishermen historically used the cave as a shelter during sudden summer storms due to its deep interior and protected ceiling.

Nearby Landmarks

Arza Fortress – 1.8km Northeast

Mamula Island (Fortress) – 2.5km North

Žanjic Beach – 2.0km Northeast

Mirišta Inlet – 2.2km Northeast