Scale 1:5,500,000 ; Lambert conformal conic projection with two parallels Insets: Guantanamo Bay, Cuba; ca. 1:400,000.--Porto Rico and the Virgin Islands; ca. 1:1,300,000.--The Panama Canal and the Canal Zone (with cross-section showing extent of canal excavation); ca. 1:500,000. Relief shown by bathymetry, spot heights and gradient tints. Insets: Guantanamo Bay, Cuba; ca. 1:400,000.--Porto Rico and the Virgin Islands; ca. 1:1,300,000.--The Panama Canal and the Canal Zone (with cross-section showing extent of canal excavation); ca. 1:500,000. prepared especially for the National Geographic magazine.