JoanRoca: Belgian Spring
JoanRoca: Unidentified hot spring
JoanRoca: Porcelain Basin
JoanRoca: Firehole Spring
JoanRoca: Grand Prismatic Spring
JoanRoca: Grand Prismatic Spring
JoanRoca: Morning Glory Pool - year 2004
JoanRoca: Morning Glory Pool - year 2008
JoanRoca: Percolate Spring
JoanRoca: Abyss Pool
JoanRoca: Chromatic Pool
JoanRoca: Crested Pool
JoanRoca: Shield Spring
JoanRoca: The mineral deposits between the pools and the lake Yellowstone.
JoanRoca: Runoff entering the Firehole River
JoanRoca: Mud Pod