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These are the biggest risks to APAC growth in 2016
These are the biggest risks to APAC growth in 2016 · CNBC

The good news: Asia Pacific is expected to remain the fastest-growing area of the global economy in 2016, according to IHS Global Insight. The bad news: a slew of factors threaten to imperil economic activity in the region.

In a note to clients, Rajiv Biswas, chief economist for Asia Pacific at IHS, wrote the region's growth prospects are supported by numerous regional, bilateral free-trade agreements and development initiatives such as the Asian Infrastructure Investment Bank.

Biswas told CNBC he expects the base case scenario for Asia Pacific economic growth to be 4.6 percent in 2016, broadly similar to last year's pace.

There are several headwinds, however, that threaten to derail the region's growth prospects:

Most economists forecast China's annual growth for 2016 and beyond to remain below the 7 percent mark as the economy undergoes a major transformation to even out imbalances built during the boom years.

The country's rapid growth in the last decade resulted in its "share of world [Gross Domestic Product] rising from 5 percent in 2005 to an estimated 15 percent in 2015," said Biswas. This has increased the rest of Asia's exposure to China, which has become a major trading partner and market for exports.

Asian countries were the "biggest winners when China was rising in the last decade" but now "they are the most vulnerable to the China slowdown," Biswas said.

IHS estimates China's growth for 2016 to be at 6.3 percent, with consumption becoming an important driver for growth, contributing to an estimated 58 percent of GDP growth in 2015 and spurring on the services sector. Biswas said the chance of an economic hard landing in the next two to three years stood at 25 percent.

UBS Wealth Management echoed similar concerns over China in their 2016 outlook released late last year. The worries include high leverage, over-reliance on credit for growth, oversupply in property markets, and overcapacity in industrial sectors.

Further down the road, however, China faces another notable challenge - an older workforce. In his recent book, Asian Megatrends, Biswas explained an already aging demographic will start to tighten China's labor force, acting as a drag on economic growth.

China's taking steps to address the issue. Last year, Beijing amended its long-held one-child policy to prop up falling birth rates but the impact, if any, will not be felt in the immediate future.

The impact of China's slowdown, and its effect on rest of the region, will also put corporate borrowers in Asia with large foreign-currency debt under pressure, particularly if the dollar continues to rise against local currencies.