And the Mare [ma:rə], round crater lakes (near Bonn), and a few lakes called Meer like Steinhuder Meer (which looks like Steinhude Sea but really means Steinhude Lake), das Kaspische Meer, das Tote Meer. Then you have das Eismeer, die Weltmeere, die Ozeane, die Sieben Seen (Sieben Meere) (ambiguous as mentioned, the first could refer to seven lakes or all of the world's oceans). And the fact that the sea to the top left of Germany is the Nordsee but the one to the top right is the Ostsee is puzzling. Fun fact: the moniker 'North Sea' has only in the 20th c become commonplace among all the languages surrounding it; on old Dutch maps, back when the IJsselmeer was called the Zuiderzee, it's more commonly marked up as De West Zee (also occ. Nord Zee, Duitse Zee / Oceanus Germanicus).