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As per Wikipedia's History of Kolkata page:

After the territorial conquest of Bengal in 1757, the British East India Company pursued a monopoly on production and export of opium from India. The company bought opium from local traders and later directly from farmers, and sold it at auction in Calcutta. From there much of it was smuggled to Canton in China by foreign traders, eventually leading to the First Opium War (1839–1842).

Given that Calcutta was not anywhere near Canton and there weren't any direct routes (or were there?) from Calcutta to Canton, why was Calcutta chosen for those auctions instead of some place closer? Was it simply because it was under British control or was there any other reason?

Also, what routes did these smugglers take to smuggle opium from Calcutta to Canton?

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Before railways the most efficient mode of land transportation was by river - and the Ganges River system runs nearly three quarters of the way from the opium fields (in what is modern Pakistan and Afghanistan) to Calcutta. The only comparable port facility would likely have been Bombay (modern Mumbai), but without the advantage either of large scale river transport being available in the right directions or of being on the right coast:

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Bombay/Mumbai is located just south of the "W" of Western Gatts; Calcutta at the west end of the Ganges river delta, just west of the modern India-Bangladesh border.

Note also that the Indus River system could provide transport from the opium fields almost to Delhi (somewhat upstream from the "t" of Indo-Gangetic Plain), overland over very flat terrain between the two river systems, making the overland transport to Calcutta more than 95% by river barge/boat.

Delhi is of course historically the great cross-roads of Northern India, being both easily defended and well situated near the shortest land route between India's two great river systems; and far enough north to be somewhat cooler than more southern locales.

  • Technical correction: River transport is more energy efficient than trains. Source: energyskeptic.com/2015/… . First is large cargo ships, second is river barges, third is trains. (Trucks, cars, airplanes are distant losers.) In fact, if you're going down-river, you could just shut off the engine and let the barge drift, as long as you can steer with something. The fuel rate of that would be zero, making an infinitely efficient vehicle. – DrZ214 Jun 6 '17 at 12:11
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Calcutta had two functions.

One, it was an assembly point for opium gathered from other parts of India because many rivers flowed in that direction from near the opium fields as Pieter mentioned.

Second, it was a port in the part of India (east) "nearest" to China and under British control. That was until Britain conquered Burma (Myanmar) after 1824, which had few good ports that also had overland connections to Opium producing areas.

Third, as of 1772, Calcutta was the headquarters of the British East India Company that ran the opium trade. It was then linked to a Bengali hinterland that produced "some" opium. The East India Company also controlled Bombay (Mumbai), but the surrounding "hinterland" was mostly Indian-controlled until about 1800.

From there it was shipped by sea and smuggled through the port of Canton (the nearest large Chinese port to India). The opium could actually have originated in any British-controlled port in the world, even London, with the smuggling occurring only upon arrival in Canton.

There wasn't a problem with shipping or "smuggling" the opium out of Calcutta or across the sea.

  • Bombay (ie Mumbai) is also a good port; slightly closer as he crow flies to the opium fields; and nearly the same distance from the Singapore Straits. Your reasoning is inadequate to explain why Calcutta was the preferred port over others such as Bombay/Mumbai. – Pieter Geerkens Jul 12 '16 at 20:18
  • @PieterGeerkens: I added a third point: Calcutta was the headquarters of the British East India Company. And I never claimed that it was the "preferred" port. The OP only asks about Calcutta as A "node". As far as I know, the opium trade was conducted out of Bombay and other ports as well. I also added a brief passage to my first point about the river system. – Tom Au Jul 12 '16 at 20:51
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    Opium was grown in Bengal and later all over western India, however during 1780-1800 East India had control over only Bengal so Calcutta was best suited for growing and shipping – siddhant Kumar Aug 5 '16 at 16:15
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Opium can be grown in almost any climate and the British used the Bengal region (modern day states of West Bengal and Assam in India and Bangladesh) as they were directly controlling these regions. It would have been practically impossible to gain control over trade from Afghanistan/the Indus river region in those days as the British East India company had no control over these regions.

Calcutta port was in their control so they shipped it to China from here.

Edit: The smuggling of Opium started as early as 1780

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