Rogoi (Greek: Ῥογοί or Ῥωγοί) is a Byzantine castle in Nea Kerasounta near Preveza, in western Greece. It is located on the site of the ancient city of Bouchetion (Βουχέτιον), which was abandoned in the late 1st century BC. Re-occupied in the 9th century, it became a bishopric and was refortified, playing an important role in the region's history in the 14th and early 15th centuries. It was abandoned again after the Ottoman conquest in 1449.
The castle is located some 4.5 km southwest of the village of Nea Kerasounta, on a 29 m tall hill on the northern bank of the Louros river, which surrounds the base of the hill on the eastern, southern and western sides. The castle was built on the location of the acropolis of the ancient city of Bouchetion. Despite its inland location today, in Antiquity the hill seems to have been an island, and literary references confirm that Rogoi remained a coastal location in the Middle Ages as well, with the Ambracian Gulf extending further to the northwest than it does today.
The site was identified by 19th-century scholars with ancient Charadrus, until N. G. L. Hammond established its modern identification with the ancient city of Bouchetion. Bouchetion was an Elean colony founded in the 7th century BC, and served as the port for the inland settlements of Elatria (at the modern village of Palaioroforos, 10 km west of Rogoi) and Baties (modern Kastro Rizovouni, some 7 km to the north of Rogoi). In the 4th century, Bouchetion was incorporated into the unified kingdom of Epirus by the Molossian king Alexander I (r. 350–331 BC). The town followed the fortunes of the Epirote state. In 167 BC, it was sacked during the Third Macedonian War. Although its strategic location ensured that the site remained occupied thereafter, it was eventually abandoned after the foundation of Nicopolis in 28 BC.