They were songs sung by sailors. Back in the day of sailing ships they had no engines to do such heavy work as raising the anchor or trimming the sails. That kind of work had to be done by gangs of men all working together. To help them work together they sang rhythmic songs, which were the origin of shanties.
In the sea ;D
Sea foam.
in the sea
german
They come from the sea.
A map of the Aral Sea drainage basin is at the link
She is a Greek goddess.
sea salt or salt mines
Neptune the romen god of the sea.
Western Depression are the cyclones which originate in the Mediterranean Sea.
Northern Europe and areas around the Black Sea.
Hurricane Sandy first formed in the Caribbean sea.