Which preposition to use with courland

with Occurrences 2%

Lenine and Trotzky stating that they would sign the peace treaty on the German terms, which included all the territory claimed by Germany along the eastern coast of the Baltic Sea, comprising the western part of Esthonia, Courland with the Moon Islands in the Gulf of Riga, most of the provinces of Kovno and Grodno, and nearly all of Vilna, with a huge indemnity.

Which preposition to use with  courland