The surface of the Red Planet is full of surprises.

While the Grand Canyon and Mount Everest are both impressive features on Earth, they are nothing next to Valles Marineris and Olympus Mons, their epic Martian counterparts.

Even more extraordinary, the overall difference between the highest and lowest point on Mars is 19 miles (31 km), whereas just 12 miles (20 km) separates the summit of Mount Everest from the bottom of the Mariana Trench on Earth.

This week’s map comes to us from Reddit user /hellofromthemoon, who carefully laid out the terrain of Mars in awesome detail.

Take a look…

Image: Reddit user /hellofromthemoon

Lay of the land

Mars can be divided into two major regions, separated by a ridge of mountains roughly around the planet’s middle.

On the north side are lowlands that have been shaped by lava flows, creating a surface dominated by large plains. Meanwhile, the southern hemisphere is mountainous, with many meteorite impact craters, some of which stretch for hundreds of kilometers.

The plains game

The plains of Mars fall into two categories: the planitia (Latin for “plains”) and the maria (Latin for “seas”). The latter type is named after the sea because these regions appeared to be under water in the eyes of early astronomers. But actually, the surfaces of these regions are covered with many rocks, making them look darker to the eye.

The second type of plains are the planitia, and they account for vast areas covered by sand rich in iron oxide. The strong winds that blow the sand and dust around can change the configuration of the plains, forming new patterns on the surface of Mars. However, the planet’s features remain relatively unchanged over time.

One of the largest plains is the Utopia Planitia (Latin for “Nowhere Land Plain”) impact basin. This giant impact crater lies within a larger lava plain. With an estimated diameter of 3,300 km, Utopia Planitia is the largest recognized impact basin in the solar system.

As above, so below

The northern and southern hemispheres are vastly different from one another on Mars, and such a stark difference is unlike any other planet in the solar system. Patterns of internal magma flow could have caused the variation, but some scientists think it is the result of Mars taking one or several major impacts.

About 4.5 billion years ago, Mars formed from the collection of rocks that circle the sun before they formed the planets. Over time, the red planet’s molten masses differentiated into a core, a mantle, and an outer crust.

Understanding how the red planet’s topography changes over time is a crucial step in grasping how the planet formed. That is why NASA launched the InSight Mars lander on May 5, 2019. This probe will listen for vibrations deep within the Martian crust to further understand the composition of the planet.

Site selection

Understanding the topography of Mars is critical for any mission to the planet, including the selection of a site for a potential colony. There are three basic criteria for picking a manned mission landing site:

1. A spot that is sustainable in terms of water, energy generation, and building materials.

2. A spot that is scientifically interesting for a long mission.

3. A spot that is safe to land.

Brian Hynek, a planetary scientist and Director of the Center for Astrobiology at the University of Colorado at Boulder, offers five potential landing sites:

1. Outer edge of Mars’ North polar ice cap

2. Deep canyon of Valles Marineris

3. Martian “glaciers” in the Hellas Basin near Mars’ mid-latitudes

4. Arabia Terra

5. Martian lava tubes and caves

With growing information from every new mission to Mars, a greater picture will help guide future human activity and ambitions on the planet.