Its boosters tout its massive economic promise and claim it could benefit the entire world and lift millions out of poverty.
But no one can say for sure what exactly the plan encompasses, and detractors warn it could be an expensive boondoggle at best or a massive expansion of Chinese imperial power at worst.
So what is One Belt, One Road?
No one is totally sure. At the most basic level, One Belt, One Road (OBOR) is a collection of interlinking trade deals and infrastructure projects throughout Eurasia and the Pacific, but the definition of what exactly qualifies as an OBOR project or which countries are even involved in the initiative is incredibly fuzzy.
"It means everything and it means nothing at the same time," said Christopher Balding, a professor of economics at Peking University.
Why is it so unclear?
While it might have originally had a comprehensible thesis behind it, OBOR has become such a popular buzzword that it's next to impossible to lock down criteria for how any given project would or could fit into the overall initiative.
Chinese officials tend to mention it regardless of what they're trying to promote, like a US lawmaker talking about "freedom."
Chenggang Xu, a professor of economics at the Cheung Kong Graduate School of Business, said it helps to think of OBOR as a "philosophy" or "party line," rather than anything concrete.
As an example of what an all-encompassing buzzword its become, state media has claimed OBOR will benefit: the Middle East peace process, start-ups in Dubai, currency trading, global poverty reduction, Xinjiang's medical industry, Australian hotels, nuclear power, Polish orchards, and, finally, the entire world.
Jörg Wuttke of the EU Chamber of Commerce in China, warned this week the initiative has increasingly "been hijacked by Chinese companies, which have used it as an excuse to evade capital controls, smuggling money out of the country by disguising it as international investments and partnerships."
What's with the name?
Confusion about OBOR isn't helped by its lack of a clear name or even a settled upon abbreviation.
The initiative consists of two major parts:
These two projects are known collectively as One Belt, One Road, or Belt and Road, or the New Silk Road.
What does China get out of this?
According to Chinese state media, some $1 trillion has already been invested in OBOR, with another several trillion due to be invested over the next decade.
There are two main benefits for Beijing from this: economic, and political -- both with their own significant risks.
What are the economic benefits?
As its runaway economic growth has slowed in recent years, China has suffered from widespread overcapacity in heavy industries such as steel, cement and aluminum.
Ways of dealing with declining domestic demand include cutting jobs -- more than 1.2 million in 2016 and 2017 -- and expanding demand overseas.
"China is looking to use OBOR as a way to ship its own domestic overproduction offshore," said Nick Marro, an analyst with the Economist Intelligence Unit (EIU).
The project will also open new markets for Chinese goods, shoring up the country's economy against any potential slowdown in demand from Europe or the US, said Jin-Yong Cai, former head of the International Finance Corporation.
"(China is) leveraging their own capital to get involved in helping (other) countries to get wealthier so they can become customers of Chinese products," he said.
What are the economic risks?
While China stands to reap major benefits from OBOR projects, it is also footing a significant proportion of the risks entailed with them.
Many key countries targeted by OBOR -- in central Asia, Africa and southeast Asia -- are prone to economic and political instability and corruption.
What happens when an OBOR project funded by the Chinese government fails is unclear, said Xu. He warned that if a series of projects fail at the same time, "then the whole thing could collapse."