Location: The Maw

"The Maw arrives every year. Always at the same time, but never in the same place, it creeps and crawls and buries its claws deep beneath the glistening water. And there it sits in vast silence. Waiting.
Soon after, they start to arrive. The guests. The monstrous, sweating, hungry guests. All seams bursting, bodies bulging, eyes dead with boredom. They shuffle up the gangway and into the mouth of The Maw. And then they are no more. For none of those that enter have ever returned to tell the tale. At least, not yet..."

— Official Little Nightmare Website

The Maw

The Maw is the main location in Little Nightmares where all the gameplay takes place. It is described being adjacent of underwater resort that caters to the extremely wealthy and powerful elite. Decrepit and mangled structures are fused together with metal rivets and rusted pipes to amass to its colossal vessel. While it is never fully explained how the Maw came into existence, it is said to be because hunger exists along with it.