The Lyngbakr (ᛚᛃᛝᛒᚨᚲᚱ) is a huge whale-like sea monster that is described in Örvar-Odds saga. The name Lyngbakr comes from the Icelandic words lyngi meaning "heather" and bak meaning "back."
It is said to be living in the Greenland sea and to be disguised as a heather covered island.
When the crew walked onto the island it sank back into the sea drowning the crew.
The troll Ögmundr Floki is said to have summoned Lyngbakr along with Hafgufa in order to kill all of Örvar-Odds men and prevent the revenge he sought.