河流上中下游景觀線上測驗

圖片來源：
PERU. URUBAMBA RIVER BETWEEN CUZCO AND AGUAS CALIENTES. HEADWATER OF THE AMAZON RIVER. Photograph. Encyclopædia Britannica Image Quest. Web. 2 Oct 2011.http://quest.eb.com/media/image.htm?mediaId=148_1830881
Salmon River. Photography. Encyclopædia Britannica Image Quest. Web. 2 Oct 2011. http://quest.eb.com/media/image.htm?mediaId=139_2003798
Aerial Of Copper River Delta. Photography. Encyclopædia Britannica Image Quest. Web. 2 Oct 2011. http://quest.eb.com/media/image.htm?mediaId=131_1423034