Loch Ness

Loch Ness is 37 km long, 2.7 km wide, and up to 227 metres deep — containing more fresh water than all the lakes in England and Wales combined. The first written account of a monster in the loch appears in the Life of Saint Columba (565 CE), which describes the saint commanding a water beast not to attack a swimmer. The modern legend began with a 1933 newspaper account by John Mackay, followed by a photograph by R.K. Wilson in 1934 that dominated public imagination for decades before being revealed as a fake in 1994.

Over 1,000 formal sightings have been logged since 1933. Systematic sonar surveys of the loch have detected large moving objects that do not match known fauna, though none have produced definitive identification. A 2018 environmental DNA study found no evidence of a large unknown species in the loch, detecting instead abundant eel DNA — leading to the hypothesis that the sightings represent unusually large eels, wave patterns, floating peat mats, or misidentified otters.