Planinsko polje

Planinsko polje, one of Slovenia’s most striking karst fields, lies in the heart of the Notranjska region, just a short drive from the towns of Postojna and Planina. This expansive plain, covering approximately 11 square kilometers, is a textbook example of a karst polje—a flat-bottomed depression formed by the dissolution of limestone and shaped by the interplay of surface and underground water. The polje is bordered by forested hills and dotted with meadows, seasonal lakes, and sinkholes, creating a landscape that is both dramatic and serene.

The history of Planinsko polje is deeply intertwined with the region’s geological and human past. Archaeological finds indicate that the area was inhabited since prehistoric times, with settlements taking advantage of the fertile soils and abundant water. Over centuries, the polje has served as a natural corridor between the Adriatic coast and the interior of Slovenia, making it an important route for trade and migration. The nearby village of Planina, with its medieval castle ruins and historic churches, reflects the area’s long-standing significance. During the Middle Ages, the polje was often subject to disputes between local nobility, and its strategic location made it a site of military and economic importance.

Today, Planinsko polje is celebrated for its natural attractions and outdoor activities. One of the main highlights is Planina Cave (Planinska jama), a vast and mysterious underground system where the Unica River disappears into the depths. The cave is accessible to visitors and offers guided tours that reveal impressive chambers, stalactites, and the unique hydrology of the karst. The Unica River itself is a defining feature of the polje, meandering across the plain and creating a network of channels, especially visible during seasonal floods. These floods transform the landscape into a temporary lake, attracting migratory birds and providing a spectacle for nature enthusiasts and photographers.

Other nearby attractions include the world-famous Postojna Cave and the dramatic Predjama Castle, both within easy reach by car or bicycle. The Notranjska Museum in Postojna offers further insight into the region’s geology, history, and culture. For those seeking active pursuits, Planinsko polje is crisscrossed by cycling and hiking trails, including a section of the Way of St. James pilgrimage route. The flat terrain makes it ideal for leisurely walks and bike rides, while the surrounding forests are home to diverse flora and fauna, including rare butterflies and bird species. Birdwatching is particularly rewarding in spring and autumn, when the flooded polje becomes a haven for waterfowl.

Practical information for visitors: Planinsko polje is easily accessible by car from Ljubljana (about 45 minutes) or Postojna (15 minutes). Public transport options are limited, so driving or cycling is recommended. The best time to visit depends on your interests—spring and early summer offer lush scenery and abundant wildlife, while winter brings the dramatic spectacle of flooding. Facilities in the immediate area are limited, but nearby villages provide accommodation, restaurants, and visitor services. Guided tours of Planina Cave can be arranged in advance, and local tourism offices in Postojna or Planina can provide maps and advice.

Seasonal advice: The climate is continental, with warm summers and cold winters. Flooding typically occurs from late autumn to early spring, so check local conditions if you plan to hike or cycle. Waterproof footwear is recommended during wet periods. In summer, the polje is dry and ideal for outdoor activities, while autumn brings vibrant colors and fewer visitors. Regardless of the season, Planinsko polje offers a unique window into Slovenia’s karst landscape and a tranquil escape from the crowds.