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Christmas Tree-Shaped Fjords Seen from Space (Photo)

This Envisat image combines three different radar observations acquired over the Westfjords peninsula in northwest Iceland. (Image credit: ESA)

The long, narrow fjords carved into the coast of Iceland make parts of the volcanic island country look like Christmas trees from space.

This image of the Westfjords peninsula in northwest Iceland combines a series of radar observations from the European Space Agency's (ESA) now dead school bus-size satellite Envisat. The gray areas show land, while the colorful sections stand in for water, and the white dots near the middle of the image are radar reflections from the region's largest town, Ísafjörður, according to ESA.

Today, Iceland has more land covered by glaciers than all of continental Europe. And even icier periods of the past left their mark on Iceland's face. Advancing ice blocks gouged deep valleys into Iceland's mountains during ice ages. But after the ice melted during warmer periods, these gorges were filled with saltwater from the coast, creating fjords, as this video from ESA explains.

Researchers created this image by combining Envisat radar observations from the same area on three separate days: Sept. 11, 2004; April 14, 2007; and May 3, 2008.

The $2.9 billion Envisat satellite was originally designed to snap high-resolution photos of Earth for five years, but ended up completing a 10-year mission before it went dark in May 2012.

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Megan Gannon
Megan has been writing for Live Science and Space.com since 2012. Her interests range from archaeology to space exploration, and she has a bachelor's degree in English and art history from New York University. Megan spent two years as a reporter on the national desk at NewsCore. She has watched dinosaur auctions, witnessed rocket launches, licked ancient pottery sherds in Cyprus and flown in zero gravity. Follow her on Twitter and Google+.