How far does the coastal plain extend

Which coastal plain? Please explain, and we'll try to help you.

The term "coastal plain" refers to a flat or gently sloping land area adjacent to a coast. Coastal plains can be found in many different regions around the world, so in order to answer your question, we need to know which specific coastal plain you are referring to. Coastal plains can vary in size, so there isn't a fixed distance that they extend. Please provide more information about the specific location so we can assist you better.