![](c20_fig17.jpg)
Figure 20.17Migrating barrier islands at Chatham, Massachusetts, at the southern tip of Cape Cod. (a) Aerial view of Monomoy Point. This spit has advanced into deep water to the south (foreground) from barrier islands along the main body of the Cape to the north (background). (b) Changes in the shoreline at Chatham over the past 160 years.