The Gulf of Finland is a body of water located in Northern Europe, forming part of the northeastern section of the Baltic Sea. It is bordered by Finland to the north, Estonia to the west, and Russia to the east. The gulf is approximately 400 kilometers long and varies in width, with its widest point reaching about 130 kilometers. The gulf is significant for maritime activities, including shipping and fishing, and is home to several important cities, such as Helsinki in Finland and Tallinn in Estonia. The region is also known for its diverse ecosystems, supporting various marine life and bird species.