Linaewen
From Tolkien Gateway
In the eastern lowlands of the country of Nevrast, a vast marshland of reeds and pools had grown. In the midst of these Marshes of Nevrast, the waters came together into long, narrow lake, whose margins abounded with wading birds of every kind. It was from these birds that it took its name: Linaewen is Elvish for 'lake of birds'.