The phrase "a vast gap in" is correct and usable in written English.
It can be used to describe a significant difference or disparity in a particular area, such as knowledge, resources, or understanding.
Example: "There is a vast gap in the educational resources available to students in urban versus rural areas."
Alternatives: "a significant disparity in" or "a considerable divide in".
Essex County has one of the sharpest contrasts between rich and poor in the nation, a vast gap in fortunes exceeded only by Manhattan, Washington and poor counties in the deep South and far West, according to measures that the Census Bureau released for the first time last week.
Fairfield County has one of the sharpest contrasts between rich and poor in the nation, a vast gap in fortunes exceeded only by a few other places, led by Manhattan but most of them poor counties in the deep South and far West, according to measures that the Census Bureau released for the first time last week.
The 2006 study showed a vast gap in perspectives on race among black and white Americans.
In 2008, $15.6 billion was estimated to be available from all sources to fight HIV, yet UNAIDS predicts $25 billion will be needed for HIV services in 2010 -- this is a vast gap in funding and one that we must fill to stop HIV blighting another generation.
However, there still exists a vast gap in our knowledge of causal genetic factors for ID as evidenced by low diagnostic yield of genetic screening, in which identifiable genetic causes are not found for the majority of ID cases.
The report found a similarly vast gap in the raw numbers of defaults in Standard & Poor's data.
The second group is treated as homogenous – when any parent would tell you that there's a vast gap between 13 and 18 in terms of understanding and what is appropriate to view.
An unexpected role model, perhaps, for the president of a country in which a vast gap between rich and poor has increased over his 33-year rule.
Hereford are ninth in the Conference, Leicester sixth in the Premiership - a vast gap of 95 places.
That's a vast gap, and it's why bears believe that the market is, in the words of the high-profile money manager John Hussman, "overvalued, overbought, overbullish".
But there is a vast gap between even the most interactive computer game and genuine narrative, and this novel dissipates much of its power in that empty space.
