From rugged mountains to river paths
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Feel the pulse of the earth beneath your feet as you race through the heart of Croatia’s Istrian peninsula in the ISTRIA 100 by UTMB races.
Buzet, known as the “city of truffles”, provides a breathtaking backdrop of rolling hills, sprawling vineyards, and ancient medieval towns.
The course unfolds across a mixture of terrains, from rugged mountain trails to serene river paths. Each kilometer reveals landmarks, such as the towering Motovun Forest and the gleaming Mirna River. As you navigate the course, you’ll be treated to an array of experiences – the scent of wildflowers, the hushed whispers of the forest, and the distant echo of the crashing Adriatic Sea.
Runners can choose from five different race distances: 21k, 42k, 69k, 110k, and 100 miles, each with its own unique set of challenges and surprises.
Beyond Race Day
- Explore the enchanting medieval town of Motovun, perched high above the Mirna River.
- Experience the thrill of a guided truffle hunt in the lush forests surrounding Buzet.
- Visit the hidden gem of Hum, officially recognized as the world's smallest town.
- Conquer the physical challenge of the Parenzana trail, a former railway line turned scenic hiking trail.
- Sail along the Adriatic coast, taking in the stunning Istrian coastline with its crystal-clear waters and picturesque fishing villages.
Run Adventures Near This Race

Slovenia + Croatia
