Perhaps a loaf tin.
A long narrow cut is called a slit.
A long narrow racing boat is called a racing shell.
a LONG NARROW CUT IS CALLED A SLIT. IT MEANS A LONG ROAD SPLIT IN 2.
Any "Long narrow arm of the sea" would be called a FJORD.Hope that helps!
A long narrow region of land with water on each side is called and isthmus
A long narrow part of land that is almost all surrounded by water is called a peninsula.
A long narrow chain of hills and mountains is called a mountain range or a mountain chain.
The long narrow bone in the lower part of your leg is called the fibula.
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Fault
I have heard it called the rim.
Needle