Watershed areas are found in the brain, where areas are perfused by both the anterior and middle cerebral arteries, and in the intestines, where areas are perfused by both the superior and inferior mesenteric arteries (i.e., splenic flexure).
Specific zones can be identified in the brain, where areas receive dual blood supply from both the anterior and middle cerebral arteries, and in the intestines, where regions are supplied by both the superior and inferior mesenteric arteries, notably at the splenic flexure.