Referred to as the Lake Stevens Monster, the giant rock is considered the largest erratic in Washington and maybe in the United States. It measures 34 feet tall and 78 feet in length with a circumference of 210 feet.
Pratchett even says in The Art of Discworld that he has received a number of letters from terminally ill fans in which they hope that Death will resemble the Discworld incarnation (he also says that those particular letters usually cause him to spend some time staring at the wall).
Lake Stevens Monster near Lake Stevens. 34 by 78 feet (10 m × 24 m) and 210 feet (64 m) in circumference. Largest known erratic in Washington State as of 2011, and may be largest in the United States (but not North America; see the Alberta Big Rock).