By comparison, the Antarctic ice sheet on Earth weighs about 4 × 1018 kg, and Mars» south polar cap contains about 1016 kg of water. (newworldencyclopedia.org)
(Copyright Calvin J. Hamilton; Caption: LPI) South Polar Cap This image shows the south polar cap of Mars as it appears near its minimum size of about 400 kilometers (249 miles). (solarviews.com)
Unlike the south polar cap, the north polar cap probably consists of water - ice. (solarviews.com)