sentence: Coast lakes are former bays that have been cut off from the sea.
sentences_before: This coast has several spits, dunes and coastal lakes.
sentences_after: These areas are sometimes called lagoons. Szczecin Lagoon is on the western border with Germany. The Vistula Lagoon is on the eastern border with Kaliningrad, province of Russia.
concept_name: coast lake
headings: Poland Geography
categories: European Union member states