Yellowstone NP - Heart Spring and Lion Geyser Postcard

UNESCO WHS Serie - Yellowstone National Park - Upper Geyser Basin - Heart Spring - Yellowstone National Park is a protected area showcasing significant geological phenomena and processes. It is also a unique manifestation of geothermal forces, natural beauty, and wild ecosystems where rare and endangered species thrive. It also has the world's largest concentration of geysers (more than 300 geyers). Heart Spring is located in the Upper Geyser Basin. It's a pretty pool of clear blue water, 15 feet (4.5 m) deep and 10 feet (3 m) across, enclosed by white sinter mats and orange-brown algae. The pool is generally inactive and its water temperature is a little below boiling. World Heritage Sites in the USA - Name: Yellowstone National Park Country: United States of America Location: Wyoming, Montana, Idaho Site: Upper Geyser Basin - Heart Spring Inscription: 1978 Category: Natural (vii)(viii)(ix)(x) Unesco Ref: 28 Special Feature: The card has a QR-Code on the backside to navigate for more Informationas about the site.