Final answer:
The Quiet Zone or Margin is the nearshore area along the coastline, extending from the low-tide line to beyond where waves influence sedimentation.
Step-by-step explanation:
The Quiet Zone or Margin is located in the nearshore area along the coastline. It extends from the low-tide line to beyond where waves influence the sedimentation, also known as the breaker zone. This zone is characterized by calm waters and minimal wave action, making it ideal for the accumulation of sediments and the formation of beaches.