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A narrow gap in a mountain range is called a pass or a mountain pass.
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A row or chain of mountains is called a mountain range.
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Pass
A row or chain of mountains ranged in a line is called a mountain range. A narrow gap through a mountain range is a mountain pass.
A five-letter word for "narrow mountain stream" is "brook".
They're called Fjords. (pronounced fee-ords)
An isthmus is a narrow strip of land that connects two larger land masses.
Pass
A narrow opening between hills or mountains is referred to as a "pass" or a "mountain pass." These pathways provide a route through mountainous terrain, allowing for travel between two areas that may otherwise be difficult to access. Passes can vary in width and difficulty depending on the specific terrain features.
That would be referred to as a vein, or if a valuable mineral, an ore vein.