The Serenia caverns are a series of caves up in the Great Mountains (KQGS) (Eastern mountains) between Serenia (KQGS) and the Kingdom of Daventry (KQGS).
Background[]
The caves are filled with rare ore and minerals such as Chromium. Graham (KQGS) mines rare chromium from the caverns in Serenia.
When the Hobblepots were young they were just outside the caves, up in the Great Mountains. Chester Hobblepot wrestled his lunch away from something...They believed was the eldest bear or the barest elder (naked and very old). Although it may have just been a Yeti (KQGS).
Behind the scenes[]
Caverns appear prominently twice in Serenia in KQ5 first in the mine/caves are Dark Forest where the grey elves mine for rare minerals and gems, the second is the Yeti Cave (aka the Crystal Cave where Graham mined a crystal shard (or a shard of ice crystal). The Ice Cave and cliff cave mazes appear prominently in KQ3 in the same region.
The Great Mountains are mentioned by Chester and Muriel in King's Quest Chapter 1: A Knight to Remember. In the context they are discussing their honeymoon there, and mention the caves in the mountain (the caves likely being a reference to the Abominable Snowman's cave or the series of caves down to Daventry). They mention either seeing a bear or mostly naked man. This is of course a reference to the caves explored in KQ3, and the other reference may or may not be a joke reference to the Abominable Snowman. This may also be more of a reference to the King's Quest Companions, as that is the source that names the mountains in KQ3 as the Great Mountains (other sources call it the Snowy Mountains or the Mountain Range). It is also may be a reference to KQ5, and in Chapter 2: Rubble Without a Cause, the mountains of Serenia are called the Eastern mountains. However it’s possible they are one and the same.