Sankt Petersburg or St. Petersburg (サンクトペテルブルク, Sankutopeteruburuku) is the capital of Euro Britannia (OTL Russia) and possibly its largest city before the collapse of the Europia United.

It is located at the Neva River at head of the Gulf of Finland on the Baltic Sea.The city itself is situated in the taiga lowlands along the shores of the lower reaches of the Neva River.

St. Petersburg is the location of a Transcontinental Railroad line that runs all the way to Pendragon. It is also the location of the Catherine Palace and the Euro-Britannian Court. Behind the Catherine Palace is the much larger, more modern Caesar's Palace, which is the headquarters of Augusta Henry Velaines.