Lagarfljót and Lögurinn
Lagarfljót is one of Iceland's deepest lakes covering about 140 kms from its source in Eyjabakkajökull glacier to Héraðsflói bay. The innermost section forms the lake Lögurinn with a surface of 53 square kilometers and average depth of 51 m, reaching 112 m where it is deepest. Its deep mysterious glacial waters are home to Iceland's ancient and much older equivalent of the Loch Ness Monster; the terrifying sea-worm-like Wyrm or Lagarfljótsormur.
The oldest recorded sighting dates back to 1345. It was considered a bad omen if the curved forms of the monster were spotted above the water's edge. In recent years the Wyrm has mostly kept to itself but pay close attention as you never know when it may reveal itself again!