This one
The mars axis poles have ice caps, which is frozen water on mars.
The only planet known to have liquid (flowing) water is Earth. However, Mars and possibly the moon have frozen ice caps at their north and south poles.
The white patches at the poles of Mars are composed of a combination of water ice and frozen carbon dioxide (dry ice). These polar ice caps undergo seasonal changes, expanding in the winter and shrinking in the summer due to temperature variations. Scientists study these caps to understand the planet's climate and geology.
Two planets have frozen ice caps: Earth and Mars. In November 2012 scientists found evidence of ice on the poles of Mercury. However, only the Earth has oceans.
Ice caps are areas of frozen water or gases that are created by the colder conditions near a planet's poles. In Earth's case, its tilt compared to its orbit gives us seasons, but the shallow angle of sunlight (plus the higher albedo or reflectivity of snow) means that there are large, permanently frozen ice caps in Greenland and in Antarctica.
Approximately 68.7% of the world's freshwater is contained in glaciers and ice caps, with the majority of this frozen water located at the poles. This frozen water plays a crucial role in regulating global climate and sea levels.
Around 68.7% of Earth's freshwater is locked up in ice caps, glaciers, and permanent snow at the poles.
Mars. Edit : As far as I know the ice caps contain water ice as well as frozen carbon dioxide.
It is the Earth.
Mars
Mars has frozen water at its south pole in the form of polar ice caps made up of water and carbon dioxide ice.
Earth and Mars