Q 01/05

Which waterway, flanked by the ancient Pillars of Hercules, separates Spain from Morocco?

A) Strait of Sicily

B) Strait of Gibraltar

C) Strait of Bonifacio

D) Corfu Channel

Answer · why

B) Strait of Gibraltar

The Strait of Gibraltar is only about 14 km wide at its narrowest point. If it ever closed, the Mediterranean is estimated to lose most of its water t...

Q 02/05

Which narrow strait splits Istanbul in two, leaving part of the city in Europe and part in Asia?

A) Kattegat

B) Skagerrak

C) Bosporus

D) Euripus

Answer · why

C) Bosporus

The Bosporus narrows to just 700 metres, making it the world's narrowest strait used for international shipping, with a city of millions spread along ...

Q 03/05

Which waterway between Alaska and Russia holds two islands nicknamed Tomorrow Island and Yesterday Island?

A) Bering Strait

B) Hudson Strait

C) Hecate Strait

D) Shelikof Strait

Answer · why

A) Bering Strait

In the Bering Strait, the two Diomede Islands sit on opposite sides of the International Date Line, so Russia's Big Diomede is almost a day ahead of A...

Q 04/05

Which waterway between Iran and Oman is the only sea route out of the oil-rich Persian Gulf?

A) Strait of Tiran

B) Shatt al-Arab

C) Zanzibar Channel

D) Strait of Hormuz

Answer · why

D) Strait of Hormuz

The Strait of Hormuz is one of the world's most strategic chokepoints. Its shipping lanes are only two nautical miles wide in each direction.

Q 05/05

Which artificial waterway did the giant container ship Ever Given block for six days in March 2021?

A) Panama Canal

B) Kiel Canal

C) Suez Canal

D) Corinth Canal

Answer · why

C) Suez Canal

The Suez Canal was shut when the 400-metre Ever Given was caught by strong winds and wedged across the channel, its bow and stern stuck in opposite ba...