This paper describes some of the correct, missing, and alternative conceptions which students possess related to the Gulf of Maine. Students (N=226) from grades 4, 8, and 11 were interviewed on 15 major concepts involving geology, physical and chemical oceanography, natural resources, ecology, and decision-making. The mean interview scores of the student responses were low and reflected little or partial understanding of the concepts. There was only minor improvement of student understanding through the grades and little transfer of this knowledge to current marine topics. This paper also highlights selected aspects of the Gulf's geology, ecology, and economic development. A list of curriculum materials that were designed to provide teachers with background information and classroom activities related to the Gulf of Maine are also included. (ML)