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Which countries sit below sea level, and how do the Netherlands and Bangladesh cope?

About a quarter of the Netherlands sits below sea level behind an engineered wall of dikes and polders, while Bangladesh is not mostly below sea level but sits so low on a giant delta that flooding is a constant threat.

By Team Geography

A country built below the waterline

The Netherlands wears its name plainly. About 26 percent of it lies below sea level, and without its dikes and dunes roughly 55 to 60 percent of the land would flood. The lowest point, the Zuidplaspolder, sits about 6.76 metres below sea level, among the lowest land in the European Union. (Only Denmark's Lammefjord, about 7 metres down, dips slightly lower.) What keeps that ground dry is not luck but centuries of engineering: a lattice of dikes, dunes, pumping stations, and reclaimed fields called polders.

The centerpiece is the Delta Works, built between 1954 and 1997 to guard the Rhine-Meuse-Scheldt delta. The most densely populated dike rings of North and South Holland were engineered against a storm surge with a 1 in 10,000 per year chance of occurring, a standard later reformed to a risk-based approach in 2017. It is among the most protected coastlines on Earth.

Bangladesh, low but not below

Bangladesh is often grouped with the Netherlands, but the comparison needs care. Most of the country is not technically below sea level. It is simply very low. Bangladesh sits on the world's largest delta, the Ganges-Brahmaputra-Meghna, whose area estimates run from about 105,000 to 150,000 square kilometres, and about two-thirds of the country lies less than 5 metres above the sea.

That flatness leaves it exposed. A one metre rise in sea level could inundate roughly 17 to 18 percent of the land, on the order of 25,000 square kilometres, and displace an estimated 15 to 20 million people. The threat is not a distant forecast but a present pressure from river floods, storm surges, and salt intrusion.

Two answers to the same water

The two nations meet the water differently. The Netherlands leans on heavily engineered, capital-intensive defenses. Bangladesh, with far less money per person, blends embankments with community-based adaptation and a long horizon: its Delta Plan 2100, approved in September 2018 with Dutch support, estimates about US$37 billion of investment by 2030, roughly 2.5 percent of GDP a year. One country holds the sea back with concrete and pumps. The other learns, increasingly, to live alongside it.

Quick facts

  • About 26% of the Netherlands lies below sea level, and roughly 55 to 60% would flood without its dikes and dunes.
  • The lowest point, the Zuidplaspolder, is about 6.76 m below sea level, one of the lowest land points in the European Union.
  • The Delta Works (built 1954 to 1997) protect the Rhine-Meuse-Scheldt delta, with key dike rings engineered against a 1 in 10,000 per year storm surge.
  • About two-thirds of Bangladesh lies less than 5 m above sea level on the Ganges-Brahmaputra-Meghna, the world's largest delta.
  • A 1 m sea level rise could inundate roughly 17 to 18% of Bangladesh's land and displace an estimated 15 to 20 million people.

Common questions

How much of the Netherlands is below sea level?
About 26% of the Netherlands lies below sea level, and roughly 60% of the country is at risk of flooding from the sea and rivers. A dense network of dikes, dunes, pumping stations, and polders keeps that land dry and habitable.
Is Bangladesh actually below sea level?
Most of Bangladesh is not technically below sea level, but it is extremely low-lying. About two-thirds of the country sits less than 5 metres above sea level on the Ganges-Brahmaputra-Meghna delta, which makes it highly exposed to river flooding, storm surges, and rising seas.
How do the Netherlands and Bangladesh adapt to flooding differently?
The Netherlands relies on heavily engineered defenses like the Delta Works, with its most critical dikes built to a 1 in 10,000 year flood standard. Bangladesh, with far fewer resources per person, blends embankments with community-based adaptation and its long-term Delta Plan 2100, which was developed with Dutch support.

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Below-sea-level geography clicks once dikes, deltas, and coastlines connect on a map. That is the daily context Geography builds one short lesson at a time.