Lake Oltina

Lake Oltina is a freshwater lake located in Constanța County, Romania, within the historical region of Dobruja. It is situated near the Danube River and part of the Danube Delta Biosphere Reserve. The lake is of liman origin, formed by the Danube's alluvial deposits gradually separating a bay from the main river channel.

Lake Oltina is an important wetland ecosystem, providing habitat for a variety of fish species, aquatic plants, and birds, including migratory birds. Its ecological significance contributes to the biodiversity of the Danube Delta. Fishing is practiced on the lake, and it plays a role in local livelihoods. The surrounding area is primarily agricultural land. The lake is relatively shallow, with depths varying depending on the season and water levels.