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noun, の adjective
The damp earth is where water seems to congregate, but not so much that there's a lake or ocean or anything like that. Just damp. This is a wetlands.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
If I am not mistaken, there are a lot of wetlands in Hokkaido, right?