Northern Guam geospatial information server
About this map:
This map shows the horizontal and vertical extent of closed-contour depressions in northern Guam. The map source is Taboroši, D. (2002), Karst features of Guam [MSc thesis], University of Guam, Mangilao, 324 pp. The contours were derived from a topographic contour file for the entire island of Guam by manual editing in which all features except closed contours were removed. The depressions shown on the map include depressions of a variety of origins: karst sinkholes, low-lying areas in the primary depositional surface, quarried areas, and other types.