ocr: sland Sections with Barrier-Reefs CNot to scale) 3032 ft. A HECHCHLLL B A 1. A B 440 ft.B 1248 BRTRA ft. B 2. 800 ft. A B atil B A 3. 1. - Vanikoro. 2. Gambier slands. 3. Maurua. The horizontal shading shows the barrier-reets and lagoon-channels. The inclined shading above the level of the sea (AA) shows the actual form of the land; the inclined shading below this line, shows its probable prolongation under water. DARWIN: VOYAGE OF THE BEAGLE