The New Lighthouse Of Sulina, Danube Delta. Stock Photography

A lighthouse is a tower, building, or other type of structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid, for maritime pilots at sea or on inland waterways. Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to harbors. Sulina is a town and free port in Tulcea County, Northern Dobruja, Romania, at the mouth of the Sulina branch of the Danube. Sulina is the city in Romania located at the lowest average altitude, only 4 m above sea level and is the easternmost point of Romania. The city stretches along the Danube, with most of the habitat on the right bank. Sulina is not directly connected to the Romanian road network and can only be reached by water, either on the Danube or on the Black Sea. Romania, Europe.