Answer:
Long narrow sea inlets bordered by steep cliffs is called a 'Fjord'.
Step-by-step explanation:
- A fjord is a narrow valley connected to the sea that is only wide enough to allow the seawater flow in and out.
- It is formed by two neighboring cliffs on the seashore with only a narrow slit-like open space in between them.
- Various geological actions can cause a fjord to form out of which melting of a glaciated cliff is the most common action.