The Grassmeer is a large plain that seperates the Haacobin Empire into northern and southern sections linked by the Conduit Felix. The eastern section is known as the Ager Magnus while the western is the Solum Magnus, divided by the conduit. The Ager Magnus contains the ruined kingdom of Samé.
Grasmere is a lake and also a village in the English Lake District. From the use of the word "mere" to describe bodies of water both in the real world and on Half Continent maps, Grassmeer can be assumed to mean "Sea of Grass."
Ager Magnus and Ager Magnus can be translated from Latin as "great land."