Border marker 1305 is one of the highest border markers in Quang Ninh Province, situated at an altitude of 1,305 meters. It is renowned for the "Dinosaur's Spine" trekking route—a challenging yet stunning path that attracts many travel enthusiasts. Spanning nearly 2 kilometers and featuring over 2,000 steps, the trail traverses steep, rugged peaks flanked by deep ravines and rolling mountains. It takes an average of two hours to hike from the base to the marker. From the summit, you can take in panoramic views of the majestic mountains along Quang Ninh's border region. If you visit between October and November, the path to the marker is blanketed in the white plumes of vast reed fields, creating a truly poetic landscape.