Loma Linda, Sardinia, and Okinawa Venn diagram<unk> s are regions of the world thought to have a higher than usual number of people who live much longer than average, identified by Gianni Pes and Michel Poulain. Five<unk> s" have been posited: Okinawa (Japan); Sardinia (Italy); Nicoya (Costa Rica); Icaria (Greece); and Loma Linda (California, USA).
Blue zone
Marginal zone
Trigger zone
Watershed area 
Inner nuclear layer
Outer nuclear layer
Apex 
Subventricular zone