Bothnian Bay is a northern extension of the Gulf of Bothnia, located between Finland and Sweden. It is known for its unique ecosystem, featuring a mix of freshwater and saltwater, which supports diverse marine life. The bay is also characterized by its numerous islands and archipelagos, making it a popular destination for boating and fishing. The bay experiences a cold climate, with ice cover during winter months, which influences local activities and wildlife. Important cities along its shores include Oulu in Finland and Umeå in Sweden, both of which serve as cultural and economic hubs in the region.