Berezan is an island in the Black Sea at the entrance of the Dnieper-Bug Estuary, Mykolaiv Raion, Mykolaiv Oblast, Ukraine. Located 8 kilometers from the city of Ochakiv and 4 kilometers from the resort village of Rybakivka. It is often being confused with the artificial island of Pervomaisky that is located within Dnieper-Bug Estuary. The Berezan island measures approximately 900 metres in length by 320 metres in width, the height of the northern part is 3-6 metres, the southern part is 21 metres. It is separated from the mainland by about a mile and a half of shallow water. Berezan is an integral part of the historical and archaeological reserve of the National Academy of Sciences of Ukraine "Olvia". The island is uninhabited. In the summer, archaeological expeditions of the IA NASU and the State Hermitage Museum work here. The archaeological site is regularly destroyed as a result of unauthorized excavations.

Mykolaiv Oblast, also referred to as Mykolaivshchyna, is an oblast (province) of Ukraine. The administrative center of the oblast is the city of Mykolaiv. At the most recent estimate, the population of the oblast stood at 1,091,821.