Derebey is a neighborhood in Tuşba District, in Van Province, Türkiye. Derebey lies at 1,902 m above sea level, in the Pirreşit Dağı mountains. It has 466 inhabitants. The nearest city is Erciş, 29 km to the northwest. Among the landmarks around are Van Fortress (35 km), Amiuk (16.2 km) and Tushpa (35 km).