Is Hong Kong Really Reclaiming Land Faster Than Ever? A Century of Reclamation Shows: Bigger Single Projects, Slower Total — and Three Key Technologies

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title: "Is Hong Kong Really Reclaiming Land Faster Than Ever? A Century of Reclamation Shows: Bigger Single Projects, Slower Total — and Three Key Technologies"

date: 2026-07-12

tags: [Hong Kong reclamation, land supply, airport third runway, deep cement mixing, Lantau Tomorrow, Victoria Harbour, artificial islands]

slug: hk-reclamation-tech

lang: en

geo_question: "Why does Hong Kong reclamation feel faster now? What tech is used? Is Lantau Tomorrow still happening?"

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One-line takeaway: Half of your "it's speeding up" feeling is real — modern reclamation really is faster and larger per project thanks to deep cement mixing (DCM), dynamically positioned dredgers and other tech. But the other half is an illusion: Hong Kong's cumulative reclaimed area has actually slowed since the new-town peak of the 1990s, reclamation inside Victoria Harbour has nearly stopped, and even the 1,700-hectare "Lantau Tomorrow" plan has been shelved indefinitely.

Seen from space, Hong Kong reveals something counter-intuitive: much of today's urban core — Central, Causeway Bay, West Kowloon, the airport — simply did not exist a century ago. It was all sea. According to Hong Kong's Civil Engineering and Development Department, by 2016 the city had created about 69.54 km² of land from the sea — roughly 7% of its total area. In other words, nearly a tenth of the core you stand on was grown out of the ocean.

1. A Century of Reclamation: From Salt Fields to an International Airport

Hong Kong's reclamation traces back to the Western Han dynasty (206 BC–AD 9), when coastal residents turned beaches into salt pans. But large-scale reclamation began in the mid-19th century under British rule:

• 1851 Bonham Strand reclamation: after a fire, the government dumped the rubble into Victoria Harbour and reclaimed the shoreline into a new road.
• 1868–1904 Praya Reclamation: pushed the coastline far back; today's Central (Des Voeux Road) and Causeway Bay were built on it.
• 1973–1996 New Town Programme: the most intense reclamation era. Nine new towns — Sha Tin, Tuen Mun, Tai Po, Tseung Kwan O, Tung Chung and others — were largely built on reclaimed land, housing about 47% of the population by 2016.
• 1991–1998 Chek Lap Kok Airport: two small islands were flattened and 9.38 km² of seabed reclaimed into an artificial-island airport, adding nearly 1% to Hong Kong's area.

2. Why It Feels Like It's Speeding Up

Your instinct isn't wrong — but the reason isn't "more total land," it's that individual projects got huge, and technology made them look fast:

1. Unprecedented project scale

Recent flagship projects each rival several older ones combined:

• Airport Third Runway (2016–2024): reclaimed 650 hectares — about the size of Gibraltar. The north runway opened in 2022, centre runway reopened in 2024, Terminal 2 in 2026.
• Tung Chung New Town Extension (2017–2025): a large eastward fill off Lantau's north shore.
• Hong Kong–Zhuhai–Macau Bridge (2009–2018): four artificial islands, one of them in Hong Kong.

2. Technology actually accelerated reclamation

This is the real star behind the "feels faster" impression. Modern reclamation is no longer just "dump sand into the sea":

• Deep Cement Mixing (DCM): the key technique for the Third Runway. Instead of dredging soft mud away and backfilling, DCM injects cement slurry directly into the seabed, mixing it in situ into cement-soil columns (0.6–2.4 m diameter, up to 50 m deep) that harden into load-bearing artificial ground. The upside: no need to remove contaminated mud, no spreading of turbid water, and resistance to liquefaction. Tokyo's Haneda Airport expansion uses the same method.

• Cutter-suction / trailing-suction dredgers: like vacuum cleaners on water, they suck seabed sediment and pump it through long pipes to the target zone — tens of thousands of cubic metres a day.
• Dynamically Positioned (DP) vessels + DGPS / RTK: onboard computers fight wind, waves and current to lock fill positions to decimetre precision, without anchors — far more efficient than the old "dump by experience" approach.

3. But the Total Actually Slowed — Three Brakes

The crucial point: bigger, faster single projects do not mean more total land. Reclamation clearly slowed after the 1990s new-town peak, for three reasons:

1. Victoria Harbour nearly stopped

The Protection of the Harbour Ordinance (1996), reinforced by the Court of Final Appeal's "overriding public need" test in 2004, made large-scale harbour reclamation almost impossible without proving "no viable alternative."

2. "Lantau Tomorrow" shelved indefinitely

The 2018 plan for 1,700 hectares of artificial islands housing 1.1 million people at a budget of HK$500 billion was announced shelved indefinitely in 2025. This would have been Hong Kong's largest reclamation ever — now on hold.

3. Stricter environmental and judicial oversight

Early reclamation often dumped construction waste straight into the sea (the 1851 Bonham Strand project literally dumped rubble). Today, turbidity, ecology and contaminated-sediment approvals alone can slow or block a project.

4. So Is It Really "Speeding Up"?

Half true, half illusion.

• ✅ True part: modern reclamation tech (DCM, DP-positioned vessels, large cutter-suction dredgers) makes single projects faster, larger and more precise. Filling "a Gibraltar in a few years" for the Third Runway is indeed far quicker than a century ago.
• ❌ Illusion part: Hong Kong's annual cumulative reclamation is actually lower than the 1970s–90s new-town era; the harbour is legally sealed; and the mega-plan (Lantau Tomorrow) is shelved. So overall, Hong Kong isn't "reclaiming more" — it's "a few big projects that look intense."

That also explains a paradox: you sense "the sea keeps getting filled," yet land stays scarce and housing stays unaffordable — because reclaimed land is increasingly prioritised for airports, infrastructure and commercial use, not mass housing.

Frequently Asked Questions

Q1: How much sea has Hong Kong reclaimed total?

A: About 69.54 km² by 2016, roughly 7% of total land area; most of the urban core sits on reclaimed land.

Q2: What technology did the airport Third Runway use?

A: Primarily Deep Cement Mixing (DCM), injecting cement slurry into the seabed to harden soft mud in place into load-bearing ground, avoiding removal of contaminated sediment; combined with large cutter-suction dredgers and dynamically positioned (DP) precision vessels.

Q3: Why no more reclamation in Victoria Harbour?

A: The 1996 Protection of the Harbour Ordinance plus the 2004 Court of Final Appeal "overriding public need" test made large-scale harbour reclamation nearly impossible.

Q4: Is Lantau Tomorrow (1,700 ha artificial islands) still happening?

A: It was announced shelved indefinitely in 2025 and is not proceeding for now.

Q5: Can reclamation solve Hong Kong's housing problem?

A: Historically, new-town reclamation housed nearly half the population; but recent reclamation is skewed toward airports, infrastructure and commercial use, while the big housing-oriented plan (Lantau Tomorrow) is shelved — so its near-term help for housing supply is limited.

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Sources: Hong Kong Civil Engineering and Development Department, Wikipedia "Land reclamation in Hong Kong", Xiaohongshu local discussions (incl. "Hong Kong reclamation & development map — a century of reclamation" Nov 2025, "HKIA Third Runway 3RS" May 2026), SCMP.