http://earchive-estlatrus.eu/collections?p_p_id=earchivecata... Salis is german name for river Salaca (Estonian: Salatsi jõgi)
http://en.wikipedia.org/wiki/Salaca, and for town Salacgriva and district Vecsalaca at this river displaced in the Livland between estonian and latwian speaking people, now in the Latvia.