The term 'BALTIC, FOR ONE' is a crossword solution that refers to a SEA. The Baltic SEA is a large body of water located in Northern Europe, bordered by Sweden, Finland, Estonia, Latvia, Lithuania, Poland, Germany, and Denmark. It is connected to the North SEA via the Kattegat and Skagerrak straits. The Baltic SEA is known for its shallow depths and brackish waters, making it an important habitat for many species of fish and other marine life.