The Loch Ness Monster is not a sea serpent, no.
I am not sure, but I think that it would be called a Sea loch or a Sea inlet loch.
The small sea loch (fjord) in Scotland is Loch Goil. (arm of Loch Long)A fictitious loch named Loch Gyle (near Mull) appears in a poem by Thomas Campbell.
LOCH LINNHE IS ABOUT 450 FEET DEEP WHICH IS DEEPER THAN THE NORTH SEA.
There are locks between the loch and the open sea.
Loch is the Scottish name for a flooded glacial valley that may be fresh or sea-water.
Galway Bay
The name of the lake is Loch Ness. A loch is a term used mainly in Scotland for either a lake or a sea inlet.
loch ness monster nessie
Maybe Loch Ness
Could be a bay, estuary, fjord, sea loch.
Voyage to the Bottom of the Sea - 1964 The Secret of the Loch 1-30 was released on: USA: 5 April 1965