Which preposition to use with fenlands

from Occurrences 1%

The abbey buildingone of the most perfect examples of architecture in the landserved as a stone quarry, much of the material being used to make a road over the fenland from Glastonbury to Wells.

for Occurrences 1%

And that castle is called the Castle of the Fenlands for the same reason.

Which preposition to use with  fenlands