No they are not; aquifers are in select areas under land, so the ocean separates aquifers on different land masses. On the same continents, aquifers often come out of the ground in the form of a spring, so that would be one end of an aquifer. Even if that spring was connected to the spring from another aquifer, the definition of an aquifer is that it is underground, so the aquifers themselves are not connected. Another reason they could be separated is if the ground is impermeable to water. The rainfall would go on one side or other, or would just run along the ground and into a stream. This kind of land forms a barrier between aquifers.
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