The Strait of Hormuz Explained

On this channel, I love to talk about geopolitics, which is the interaction between geography

– how the earth shaped – and politics, how people and countries interact with each


This time we’ll discover why the Strait of Hormuz is so important, and how being narrow

has put this stretch water at the centre of global international tensions.

Before we dive into why the strait is so important, let’s find out where on earth it is.

This is the Arabian peninsula.

On one side of the peninsula, the Arabian sea is connected to the Mediterranean by the

Red Sea, which runs between the peninsula and the continent of Africa and joins the

Mediterranean Sea here, through the Suez Canal.

On the other side of the peninsula, the Arabian sea runs into the Gulf of Oman, which is connected

to the Persian Gulf.

Between these two Gulfs is this very narrow stretch of water – the Strait of Hormuz.

The Strait is bounded on either side by the countries of Iran, Oman, and the United Arab


The Strait of Hormuz helps transport LOADS of oil per day, on some of the biggest ships

on earth.

We’ll go into more detail about that in a moment.

Because of how narrow the strait is, and the volume of oil that is transported through

it, the Strait of Hormuz is the world’s most important chokepoint for the transport


Just to get an idea of the scale of the amount of oil and other energy products transiting

the strait, here’s some quick maths:

In 2018, the average number of barrels of oil and other petrol liquids passing through

the strait was about 21 million barrels per day.

Each barrel is about 159 litres, which equates to a total of over 3 billion litres, or more

than 1300 Olympic swimming pools of liquid per day.

This is about 21% of the entire world’s daily petrol consumption.

One third of all the sea-transited oil on earth travels through the strait, as well

as one quarter of all of the traded natural gas.

The Strait of Hormuz is only about 39km wide at its narrowest point.

Because of this, ships transiting the strait must stick to strict shipping lanes.

Despite its narrow width, the Strait of Hormuz is deep enough to accommodate the largest

ships on earth – the epically named Very-Large and Ultra-Large Crude Carriers.

Large ships exiting the Persian gulf via the Strait of Hormuz have to participate in a

carefully choreographed dance.

The first shipping lane starts in the territorial waters of Iran.

It then passes between 3 islands which are currently administered by Iran, but claimed

by the UAE.

Next, our supertanker must pass into Omani territorial waters to transit the narrowest

shipping lanes in the narrowest part of the strait.

Once through the strait there are more shipping lanes in the Gulf of Oman that can take ships

back into Iranian territorial waters.

We’ve talked about how the Persian Gulf is connected to the Mediterranean Sea via

the Strait of Hormuz, but actually in 2018 about 76% of the crude oil transmitted through

the Strait headed the other direction – to Asia, and most of that went to only 5 countries

– China, India, Japan, Singapore and South Korea.

To get to the large markets in East Asia, oil tankers usually have to traverse another

oil chokepoint, the Strait of Malacca – which we might talk about in another video.

So the strait of Hormuz is narrow – so narrow that it falls within the territorial waters

of the boundary countries.

This means that any incidents within the strait have the potential to shut down transit, or

at worst to spark conflict between countries.

Just a few months before the release of this video there were attacks on ships in the Gulf

of Oman, near to the opening of the Strait of Hormuz.

Incidents like these threaten the stability of the strait, and increase tensions between

boundary countries.

Now we know just how important the Strait of Hormuz is to global oil trade, we can imagine

just how damaging any disruption to the flow oil through the strait would be to countries

reliant on receiving the oil, and on those countries reliant on the income from selling


So, aside from the oil-buying countries trying to reduce their reliance on foreign oil – what

else have the oil producing countries done to try and mitigate any threats to the stability

of the Strait of Hormuz as a shipping route?

Well, only Saudi Arabia and the UAE can bypass the Strait of Hormuz by shipping outside of

the Persian Gulf AND have pipelines to get the oil to those ports.

Remember that 21 million barrels per day transited the Strait of Hormuz in 2018.

Saudi Arabia has the East-West pipeline than can transport up to 5 million barrels per

day to its port on the Red Sea, although in 2018 this pipeline was only used to transport

2 million barrels per day.

It also has a natural gas pipeline, which can transport the equivalent of 300000 barrels

per day.

The UAE has the Abu Dhabi Crude oil pipeline, to transport oil directly to the Gulf of Oman

which can pump up to 1.5 million barrels per day, but was only used for 600000 barrels

per day last year.

Other pipelines exist, but most are relatively small and cross international boundaries – so

have fallen into disuse due to recent conflict or political disagreements between countries.

So what does the future hold for the Strait of Hormuz?

Well, that is a very tricky question – and one that I probably can’t answer.

As we’ve discovered, the importance of the strait is amplified by the geography of the

region, including a lack of viable alternate shipping routes, but it’s also important

to acknowledge that the strait is fully integrated into the territorial waters of various countries

meaning that the politics of the region affects the stability of the strait as a shipping


The Strait of Hormuz will likely continue to be one of the most important shipping routes

in the world, especially if the global hunger for oil continues.

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