Republic road I-9 (Bulgarian: Републикански път I-9) is a major road in Eastern Bulgaria. It runs between the village of Durankulak, at the border with Romania, and the Malko Tarnovo border crossing to Turkey. The total length of the road is 325.6 km (202.3 mi). Most of it provides one driving lane per direction. On it entire length, Road I-9 follows European route E87. In its southernmost section the road runs through Strandzha Nature Park.