Issaouane Erg confined to basins. Sand in the Issaouane Erg, below the level of the sand dunes, has accumulated to a depth of 20 to 30 meters. It has barchan dunes as well as star dunes of 300 to 430 meters high. The presence of both barchan dunes (which form due to unidirectional winds) and star dunes (which form when winds from various directions deposit sand) "suggests that wind regimes have changed over time". NASA's "Earth Observatory" notes all three types of erg dunes are present in the photos of the Issaouane Erg taken from the International Space Station: stationary mega dunes,
Geography of French Guiana (widely scattered), cinnabar, kaolin, fish, [shrimp], rice, bananas. Arable land: 0%.<br> Permanent crops: 0%.<br> Permanent pastures: 0%.<br> Forests and woodland: 0%.<br> Other: 10% (1996 est.).<br> Irrigated land: 20 km² (1993 est.).<br> Natural hazards: high frequency of heavy showers and severe thunderstorms; flooding.<br> Environment - current issues: NA.<br> Geography - note: mostly an unsettled wilderness. Geography of French Guiana French Guiana is an overseas region of France, located on the northern coast of South America between Suriname and Brazil. See also the article on the geography of Suriname. Northern South America and part of Caribbean South America, bordering the North Atlantic