Morag is a reported monster or possibly mermaid residing in Loch Morar and a cultural icon in Scotland. Although not as famous as her fellow loch monster Nessie she is reportedly far more malicious and dangerous than her and appears to have more fantastical origins.
In ancient folklore Morag is often depicted as being a beautiful mermaid who's sighting was something to be dreaded as she was essentially something of a grim reaper for the sea, being feared by many sailors due to the legend that one would inevitably end up drowning after catching a glimpse of her.
In modern folklore the being known as Morag has instead by reported as being a literal monster. One particularly famous encounter with the creature back in 1969 saw Duncan McDonnel and William Simpson being caught in a confrontation with the beast after accidentally colliding with her on their speedboat. Infuriated she arose and began attacking the two astonished men with McDonnel trying to fend her off with his oar before Simpson managed to scare her off by firing at her with his shotgun. Following this many others have reported seeing or encountering something resembling Morag.
Connection to Nessie
While many of Scotland's loch have been reported as having monsters residing in them Morag is by far the most famous aside from Nessie herself, both creatures are very similarly depicted in recent years however, being large amphibians with almost dinosaur like appearances. This is strange as it's inconsistent with Morag's history as a mermaid while Nessie appears to have evolved with time from various different forms based on public recounts so it's possible that both creatures are simply depicted as what they want the world to see them as at given times.
In terms of their personalities Morag appears to be much more malicious and temperamental than Nessie who is almost universally seen as peaceful yet still dangerous and while the latter is a beloved and iconic figure Morag is more infamous than anything else, being something loathed and feared throughout history while being stuck in the shadow of Nessie in terms of popular culture.
Like Nessie several theories have been attributed to what Morag is, some of these include:
A large eel
A prehistoric animal
Some kind of incredibly large fish (possibly a Wel's Catfish like Nessie is guessed as)
An unidentified deep sea beast (common theory with most loch, lake and sea monsters)
Her name is a pun on both of the name of the Loch and the eponymous forename native to Scotland.