Başur Höyük in Turkey's south-eastern Siirt Province is a 5,000-year-old Bronze Age burial site. It is located just outside the city of Siirt near the village of Aktaş in a valley of the upper Tigris River, adjacent to the Başur River. The 820-foot by 492-foot burial mound was excavated in the years up to 2018, by Brenna Hassett of the Natural History Museum in London, and Haluk Sağlamtimur of Ege University in Turkey.