The long narrow female part of a cricket is called the ovipositor. It is used by female crickets to lay eggs in the soil or plant material. The ovipositor can vary in length and shape among different species of crickets, but it generally appears as a pointed extension at the rear of the female's body.
A long narrow cut is called a slit.
A long narrow racing boat is called a racing shell.
A long narrow cut could be called a gash or a slash, depending on the context or severity of the wound.
Any "Long narrow arm of the sea" would be called a FJORD.Hope that helps!
A long narrow region is often referred to as a strip or a corridor.
A long narrow part of land that is almost all surrounded by water is called a peninsula.
The ureters are two narrow tubes and each is about 10-12 inches long
A long narrow chain of hills and mountains is called a mountain range or a mountain chain.
Fault
Perhaps a loaf tin.
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The long narrow bone in the lower part of your leg is called the fibula.