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The valley of the Mirna River is one of the most beautiful natural landscapes in Istria. Stretching for 53 km, the Mirna is the longest river in Istria. It originates in the village of Kotli, near Hum, and flows through a picturesque landscape, passing historic settlements. Hum is considered the smallest town in the world.
South of Novigrad, the river empties into the Adriatic Sea at Tar Bay, also known as Luka Mirna. Along its course, it winds through diverse karst landscapes, including a scenic gorge near Istarske Toplice, and passes through forested areas, with the most notable being the Motovun Forest, renowned for its natural beauty and rich biodiversity. The Mirna Valley is surrounded by several fascinating settlements that tell the story of the region’s history. Among them, Buzet, Motovun, Oprtalj, and Groznjan stand out, located on the valley’s slopes and offering breathtaking views of the river and its surroundings. Buzet, often called the Gateway to Istria, is an ancient town known for its rich history, medieval architecture, and stunning panoramas. Motovun, famous for its vineyards and the Motovun Forest, is one of the most visited towns in Istria, featuring a well-preserved historic center with spectacular views of the valley. Oprtalj, a smaller and quieter village, is known for its traditional Istrian architecture and peaceful atmosphere. Groznjan, today a haven for artists, boasts narrow streets, charming galleries, and a captivating historic core. These settlements, closely intertwined with the natural surroundings of the Mirna River, offer a rich cultural heritage and unique perspectives on the Istrian landscape. The area around the river is home to a diverse range of plant and animal species, including the distinctive downy oak, under which truffles thrive. The Mirna River also provides a habitat for various bird and fish species, making it a popular spot for nature enthusiasts. Beyond its natural beauty, the river offers opportunities for hiking, cycling, and water sports, as it flows through a variety of scenic areas where visitors can immerse themselves in the untouched landscape.
One of the significant tributaries of the Mirna is the Butoniga stream, which naturally flows into the artificial Butoniga Lake, known for its reservoir and dam. This part of the valley, together with the Motovun Forest and the surrounding wine-growing regions, creates an unforgettable experience for anyone visiting this remarkable part of Istria.