A secluded valley is often referred to as a glen. Some other words that can be used to convey a secluded valley include a dell or a dale.
Secluded means far from society. It can also means obscured from sight, such as "in the secluded woods."
It usually is (a secluded beach, a secluded rendezvous). It is the past tense and past participle of the verb (to seclude: to set apart, or isolate) and can otherwise be a verb form.
Isolated
That is called a valley
As secretive as a secluded fawn
A wooded hollow is called a dell. A dell is usually a small, secluded valley that is usually in a forest.
dell, glen
In Voltaire's "Candide," the city that Candide and Cacambo discover in a secluded valley is called El Dorado. This utopian place is characterized by its immense wealth, happiness, and absence of suffering, contrasting sharply with the hardships faced by Candide throughout his journey. El Dorado represents an ideal society, free from the corruption and misery present in the outside world.
pleasance
A small, secluded, and often wooded valley is known as a dell or in Scotland as a glen. A wide, flat valley through which a river runs is known in Scotland as a strath. (from https://en.wikipedia.org/wiki/Valley)
secluded - isolated from othersI was secluded when I was excommunicated from the church.
It is called the 'Tucker Valley'
shark valley is called shark valley because it is a valley that flows into shark lake
The lowest point in a valley where two hills or mountains meet is called the valley floor.
Valley
The bottom of a valley is called the valley floor. It is typically the lowest point in the valley and where most of the water and sediment accumulates.
Sacramento is in Sacramento Valley and Central Valley.