Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Kronborg Castle' has mentioned 'Baltic Sea' in the following places:
Occurrence Sentence Text Source
In this part, the sound is only 4 kilometres (2.5xc2xa0mi) wide, hence the strategic importance of maintaining a coastal fortification at this location commanding one of the few outlets of the Baltic Sea.
Along with the fortress Kxc3xa4rnan, Helsingborg on the opposite coast of xc3x98resund, it controlled the entranceway to the Baltic Sea.
The king insisted on the payment of sound dues by all ships wishing to enter or leave the Baltic Sea through the xc3x98resund; to help enforce his demands, he built a powerful fortress at the narrowest point in the Sound.
The Sound is the gateway to the Baltic Sea and from 1429 to 1857, Denmark controlled this passage thanks to Kronborg Castle, positioned at the narrowest part of the Sound, which is only four kilometres wide.