Transboundary is a word that's used extensively, but we distinguish transboundary aquifers in two ways. One, there are aquifers crossing boundaries within Canada, and then there are aquifers crossing boundaries between Canada and the U.S.A. For the first case, we have only four, but for the second case, aquifers crossing the boundary with the United States, we have seven identified and actually already two of them mapped.
On June 9th, 2009. See this statement in context.