Independence Day 2026: When the British built a 4,000-km wall across India to extort tax

In 1995, Roy Moxham, a book conservator in London, came across a passing reference in the memoirs of a British official to an enormous hedge that once stretched across India.

The claim seemed improbable. The British authorities had built and maintained a living barrier thousands of kilometres long to enforce the salt tax. Intrigued, Moxham spent years digging through archives and travelling across India to reconstruct its history.

The result was his book 'The Great Hedge of India: The Search for the Living Barrier that Divided a People' published in 2001 which brought back into public view one of the largest and most unusual projects of revenue extortion by the British Raj.


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The tax that created the Great Wall of India

Salt was one of the most heavily taxed commodities in British India. Unlike luxury goods, salt was consumed by everyone. Rich and poor alike needed it for survival. That made it an ideal source of revenue. The origins of the problem lay in the uneven tax system that developed across British-controlled territories. Salt produced in some regions attracted much higher duties than salt available elsewhere. This created strong incentives for smuggling. Traders could buy cheaper salt in one area and transport it into regions where prices were inflated by taxation.

To stop this trade, the East India Company began establishing customs posts in the early nineteenth century. What started as a series of checkpoints gradually evolved into a continuous barrier. In 1843, the system came under the Inland Customs Department, which was tasked with preventing untaxed salt from entering high-tax regions, especially the Bengal Presidency.

Historian Roy Moxham argued that the issue was not merely administrative. Salt was an essential dietary requirement, particularly in India's hot climate. By artificially increasing prices, the colonial state was effectively taxing a necessity rather than a luxury. In his research, Moxham concluded that the tax placed a disproportionate burden on the poorest sections of society.

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From customs posts to a continental barrier

The Inland Customs Line was not initially a hedge. It began as a chain of customs houses, patrol routes and checkpoints. As British territory expanded, officials sought a more effective way to prevent smuggling across vast distances.

Over time, barriers made of thorny brushwood, deadwood and stakes were erected between customs posts. Eventually these evolved into a living hedge. By the 1860s, officials had begun systematically planting dense vegetation to create what became known as the Great Hedge of India. The scale was extraordinary. By 1869, the Inland Customs Line stretched roughly 2,500 miles, or more than 4,000 kilometres, from the northwestern frontier in Multan to Orissa near the Bay of Bengal. Contemporary observers noted that it covered a distance roughly comparable to the stretch from London to Constantinople.

The barrier was not uniform. In some places, rivers such as the Indus, Sutlej and Yamuna served as natural obstacles. In other areas, embankments, trenches and walls supplemented the vegetation. The hedge itself was constructed from locally adapted species including babool, karonda, Indian plum, prickly pear and thorny creepers. Where conditions allowed, it grew into a dense and nearly impassable barrier.

At its height, parts of the hedge reached around 12 feet in height and 14 feet in thickness. Officials described sections as "impenetrable to man or beast."

A massive bureaucratic enterprise

Maintaining the hedge required a surprisingly large administrative apparatus. In the financial year 1869-70, the Inland Customs Line employed around 12,000 personnel and operated 1,727 customs posts. Other contemporary estimates put the workforce even higher at certain periods. Guards, inspectors, labourers and gardeners were deployed across the route.

The line had to be constantly repaired. Thorn fences were vulnerable to termites, rats, storms, fires and natural decay. Allan Octavian Hume, then Commissioner of Inland Customs and later one of the founders of the Indian National Congress, became deeply involved in strengthening the barrier. He pushed for replacing temporary brushwood fences with living vegetation that would require less rebuilding.

Hume described the hedge as the system's principal defence against smuggling. According to records cited by Moxham, customs officials devoted enormous amounts of time and labour to cultivating, trimming and strengthening it. The hedge was therefore not an eccentric landscape project but a major piece of state infrastructure designed to secure revenue.

The economics of salt

In 1869-70, the Inland Customs Line collected about 12.5 million rupees in salt tax and another million rupees in sugar duties. Maintaining the system cost roughly 1.62 million rupees. From the government's perspective, it generated substantial profits. By 1877, salt tax revenue across British India had reached approximately £6.3 million, making it one of the colonial state's most lucrative sources of income.

The problem was that these revenues came from a commodity that people could not simply stop consuming. Modern historians have often contrasted the British approach with earlier Indian regimes. Salt had been taxed before British rule, but generally at lower rates. Under colonial administration, the state developed a far more systematic and aggressive mechanism for extracting revenue from salt production and distribution.

Moxham argued that the resulting increase in prices reduced salt consumption among the poor. While precise measurements are difficult, he linked the tax to broader patterns of malnutrition and vulnerability during periods of famine and disease.

The human cost of the salt tax barrier

One reason the Great Hedge has attracted renewed attention is that it highlights a less visible form of colonial extraction. The hedge itself did not kill people but the issue was the tax system it enforced.

Salt deficiency can contribute to serious health problems, especially among populations engaged in heavy physical labour in hot climates. Critics of the salt tax argued that it forced poor families to reduce consumption of a basic dietary requirement. During the devastating famine of 1877-78, millions suffered across parts of India. While famine mortality resulted from multiple causes, Moxham noted that salt shortages and poor nutrition increased vulnerability to disease.

Why the hedge disappeared

Despite its scale, the Inland Customs Line survived for only a few decades in its most developed form. The reason was not humanitarian reform but administrative efficiency as the tax rates became nearly uniform across India thus discouraging smuggling of salt into high-taxed regions.

By the late nineteenth century, the British had gained greater control over major salt-producing regions, including the important Sambhar Lake area. Once the government could regulate production more directly, maintaining a massive inland barrier became less necessary. The hedge was also expensive and cumbersome. Thousands of personnel were required to patrol and maintain it. Natural damage was constant. Smugglers continued to find ways around it.

In 1879, the Inland Customs Line was formally abolished. The hedge was dismantled and the customs organisation disbanded. Over time, villagers removed useful materials, vegetation died, embankments eroded and the landscape reclaimed what remained. Within a few decades, one of the largest barriers ever built had almost vanished.

The disappearance of the hedge from public memory is almost as remarkable as its construction. Unlike railways, canals or public buildings, the hedge left few visible traces. It was made largely of living plants. Once abandoned, it decayed naturally. Histories of the British empire rarely mentioned it while standard accounts of colonial India devoted little attention to the Inland Customs Department.

When Moxham began investigating the subject in the 1990s, he found that many historians had never heard of it. After extensive archival research and several journeys across India, he identified what may have been surviving traces of ten hedge near Etawah in Uttar Pradesh. His book remains the most influential modern account of the hedge and the system it supported.