Welsh Water Spirit That Drowns People

Puzzle 2 of Tour the Body Pack

Question is: Welsh Water Spirit That Drowns People

and the answer is: MORGEN

Word Meaning:

MORGEN — (chiefly historical) A unit of measurement of land in the Netherlands and the Dutch colonies and parts of the United States, where it was equivalent to about two acres; and in Denmark, Norway, and Germany, where it was equivalent to about two-thirds of an acre. Now used informally in Germany to mean one quarter of a hectare.

Definitions from Wiktionary.