10 most difficult seas riddles

Sable Island is believed to have formed from a terminal moraine deposited on the continental shelf near the end of the last Ice Age. It emerges from vast shoals and shallows which, in tandem with frequent fog and sudden storms, have caused over 350 recorded shipwrecks

The Tyrrhenian Sea is part of the Mediterranean Sea off the western coast of Italy. It is named for the Tyrrhenian people, identified since the 6th century BCE with the Etruscans of Italy.

This cold sea current circulates the globe in the far south. It creates a zone of very strong winds and storms, by which sailing Cape Horn is such a challenge for sailors. Depth of current exceeds 3000 m.

It is an archipelago at the entrance to the Gulf of Bothnia in the Baltic Sea belonging to Finland. It is autonomous, demilitarised and is the only monolingual Swedish-speaking region in Finland, hence the similarity of the flag above to the Swedish one.

The Baltic Sea is one of the largest brackish inland seas by area, and occupies a basin formed by glacial erosion during the last few ice ages. It is about 1,600 km (990 mi) long, an average of 193 km (120 mi) wide, and an average of 55 metres (180 ft) deep. The maximum depth is 459 m (1,506 ft).The current course of the shoreline was formed about 2 thousand years ago.

The Mackenzie River is the longest river system in Canada, and has the second largest drainage basin of any North American river after the Mississippi River. The river's main stem is flowing north-northwest from Great Slave Lake into the Beaufort Sea, a marginal sea of the Arctic Ocean, where it forms a large delta at its mouth.

The name "Gibraltar" is the Spanish derivation of the Arabic name Jabal Ṭariq, meaning "Mountain of Ṭariq". Following a raid in 710, a predominately Berber army under the command of Tariq ibn Ziyad crossed from North Africa in April 711 and landed somewhere in the vicinity of Gibraltar (though most likely not in the bay or at the Rock itself). Tariq's expedition led to the Islamic conquest of most of the Iberian peninsula.

Arafura sea is warm and shallow. During the last ice age, the sea was dry and formed a bridge for humans to reach Australia.

The area of the Danish island of Zealand is 7031 km². Swedish Gotland has an area of 3144 km², Bornhom Denmark 588 km², and Usedom 445 km².

In the 1990s several cod stocks collapsed due to overfishing. With the large predatory fish removed, their prey have undergone population explosions, and the capture of lobster has tripled since 1970.