CRONSLOT, or CROWN-CASTLE, a castle and harbour in a little island of the same name, at the mouth of the river Neva, and entrance of the gulf of Finland, in Russia, about twelve miles west of Peterburgh: E. long. 30^{\circ}, and N. lat. 60^{\circ}. Here is a station for the Russian men of war, and a yard for building and refitting them.