Riga, Gulf of, eastern arm of the Baltic Sea, bordering on Estonia and on Latvia. At its mouth it is nearly closed off by the Estonian island of Saaremaa. The gulf, which is frozen from December to April, receives the Western Dvina (Daugava) River. Riga and Pärnu are the chief ports.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.