fenland

As nouns the difference between fenland and mars

is that fenland is a kind of low-lying ground, often wet or marshy while mars is march.

Breckland is likely misspelled.

Breckland has no English definition.

As a noun fenland is

a kind of low-lying ground, often wet or marshy.

As nouns the difference between fernland and fenland

is that fernland is an area of land where ferns grow while fenland is a kind of low-lying ground, often wet or marshy.

As nouns the difference between fenland and saltern

is that fenland is a kind of low-lying ground, often wet or marshy while saltern is (archaeology) an area used for saltmaking, especially in the east anglian fenlands.