Grand Prismatic Spring - Copyright MacNeil Lyons Images
Image Title:
Grand Prismatic Spring, Yellowstone N.P., WY

Photographer's Notes:
Located in Midway Geyser Basin along the Firehole
River, north of Old Faithful; Grand Prismatic Spring
is the largest in Yellowstone! With a diameter of 370
feet, this is the third largest hot spring in the world!  
Temperatures range from 145.5 F to 188.6 F.

Photosynthetic bacteria form extensive colored mats
ranging in colors. The darker colors can be a clue to
cooler waters (relatively speaking!).

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