Paul Ganster, Director of the Institute for Regional Studies of the Californias at San Diego State University, made these images as part of research projects on the Tijuana River Watershed, including the recently published Atlas of the Tijuana River Watershed (R. Wright & R. Vela, 2005) and Tecate, Baja California: Realities and Challenges in a Mexican Border Community (P. Ganster, et al., 2002). These photographs were selected to convey information about the human and natural features of this binational watershed.