Photo of the Day: August 3, 2006NATIONALGEOGRAPHIC.COM

Ginnie Spring, Florida, 1998
Photograph by Wes Skiles

吉尼湧泉裡清澈的藍和河水裡植物丹寧酸染成的棕色交融混合。這些天然的染色劑對人類不會造成傷害；不過，佛羅里達人必須面對的是......人造的汙染將會對這些湧泉的未來罩上一層陰影。

(摘譯自"Unlocking the Labyrinth of North Florida Springs," March 1999, National Geographic magazine)