Of, pertaining to, designating or bordering upon an almost landlocked sea in Northern Europe (Russian Baltijskoe more), called by the neighbouring…

Designating (part of) the northern arm of the Baltic Sea lying between Sweden and Finland, now usually called the Gulf of Bothnia; of or belonging…

Of, belonging to, or designating (part of) the Gulf of Bothnia or the lands surrounding it; = Bothnian, adj.

Of or relating to Ingria or its inhabitants.