“Pure Land” is an inaccurate translation of buddha-kshetra, which means “field or sphere of action of the Buddha”. There are as many Pure Lands as there are Buddhas, because each Buddha has a sphere of action.
A Pure Land is not a physical location, but rather a mental plane. However, that does not render it unreal. The world that we experience now is also a mental plane. Actually, since the Pure Land is a plane in full coherence with the Dharma, it is more real than this worldly plane.