This module is an activity/discussion-centered unit focusing on the importance of shoreline surface area. The module is part of a series designed to be used by teachers, students, and community members to help them utilize community resources in developing and teaching environmental concepts and responsibility, and in seeking ways to solve environmental problems. Background information and lesson plans are provided. Also provided in an appendix are pre-post tests and masters for duplicating of two graphics, "Mangroves to Seawalls" and "Shoreline Graph" (both of which are required for student activity in the second lesson). In addition to the general information presented in the background information sections (such as the role of red mangroves in increasing the surface area of the estuary shoreline which allows large numbers of organisms a habitat for growth), six reasons why mangroves should not be allowed to be filled, bull-dozed, or altered in local counties or any other part of Florida are summarized. These reasons focus on mangrove productivity, shoreline protection and stabilization, runoff and pollution trap, wildlife habitat area, mangrove dollar economics, and uniqueness of the mangrove forests. (JN)