The images from Mars Reconnaissance Orbiter (MRO) of NASA showed that sinkholes also formed in Mars and they are found in basaltic lava flow areas. The sinkhole issue in Mars is considered in this study with some reference to sinkholes observed on Earth such as the volcanic caves in Japan, Türkiye and Hawaii Island and Mainland of USA. The geometry and size of sinkholes of Mars are categorized and their stability is evaluated on the basis of principles of Rock Mechanics and Rock Engineering with reference to those of Earth. The author presents the outcomes of this research and discusses its implications within the Planetary Rock Mechanics.

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