Cape Town is in the unenviable situation of being the first major city in the modern era to face the threat of running out of drinking water.
However, the plight of the drought-hit South African city is just one extreme example of a problem that experts have long been warning about - water scarcity.
Despite covering about 70% of the Earth's surface, water, especially drinking water, is not as plentiful as one might think. Only 3% of it is fresh.
Over one billion people lack access to water and another 2.7 billion find it scarce for at least one month of the year. A 2014 survey of the world's 500 largest cities estimates that one in four are in a situation of "water stress"
According to UN-endorsed projections, global demand for fresh water will exceed supply by 40% in 2030, thanks to a combination of climate change, human action and population growth.
It shouldn't be a surprise, then, that Cape Town is just the tip of the iceberg. Here are the other 11 cities most likely to run out of water.
1. Sao Paulo
Brazil's financial capital and one of the 10 most populated cities in the world went through a similar ordeal to Cape Town in 2015, when the main reservoir fell below 4% capacity.
At the height of the crisis, the city of over 21.7 million inhabitants had less than 20 days of water supply and police had to escort water trucks to stop looting.
It is thought a drought that affected south-eastern Brazil between 2014 and 2017 was to blame, but a UN mission to São Paulo was critical of the state authorities "lack of proper planning and investments".
The water crisis was deemed "finished" in 2016, but in January 2017 the main reserves were 15% below expected for the period - putting the city's future water supply once again in doubt.
2. Bangalore
Local officials in the southern Indian city have been bamboozled by the growth of new property developments following Bangalore's rise as a technological hub and are struggling to manage the city's water and sewage systems.
To make matters worse, the city's antiquated plumbing needs an urgent upheaval; a report by the national government found that the city loses over half of its drinking water to waste.
Like China, India struggles with water pollution and Bangalore is no different: an in-depth inventory of the city's lakes found that 85% had water that could only be used for irrigation and industrial cooling.
Not a single lake had suitable water for drinking or bathing.
3. Beijing
The World Bank classifies water scarcity as when people in a determined location receive less than 1,000 cubic metres of fresh water per person a year.
In 2014, each of the more than 20 million inhabitants of Beijing had only 145 cubic metres.
China is home to almost 20% of the world's population but has only 7% of the world's fresh water.
A Columbia University study estimates that the country's reserves declined 13% between 2000 and 2009.
And there's also a pollution problem. Official figures from 2015 showed that 40% of Beijing's surface water was polluted to the point of not being useful even for agriculture or industrial use.
The Chinese authorities have tried to address the problem by creating massive water diversion projects. They have also introduced educational programmes, as well as price hikes for heavy business users.
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4. Cairo
Once crucial to the establishment of one of the world's greatest civilisations, the River Nile is struggling in modern times.
It is the source of 97% of Egypt's water but also the destination of increasing amounts of untreated agricultural, and residential waste.
World Health Organization figures show that Egypt ranks high among lower middle-income countries in terms of the number of deaths related to water pollution.
The UN estimates critical shortages in the country by 2025.
5. Jakarta
Like many coastal cities, the Indonesian capital faces the threat of rising sea levels.
But in Jakarta the problem has been made worse by direct human action. Because less than half of the city's 10 million residents have access to piped water, illegal digging of wells is rife. This practice is draining the underground aquifers, almost literally deflating them.
As a consequence, about 40% of Jakarta now lies below sea level, according to World Bank estimates.
To make things worse, aquifers are not being replenished despite heavy rain because the prevalence of concrete and asphalt means that open fields cannot absorb rainfall.
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