Istria300 | Ride your Limits! Epic road bike routes in some of Istria’s finest roads and most spectacular locations will ensure a cycling experience of a lifetime. The start and finish line is located in the beautiful town of Poreč in Istria. The event has been sold out every time since its debut in 2021. Participants can choose the course at their preferred distance. The 300-kilometer loop will include two options: a 209 km and a 134 km loop.