Red and Yellow are sparsely populated. It's like controlling the Gobi Desert - just empty and barren land.
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What the Houthis control is where the vast majority of the Yemeni population lives - the de facto Yemen. They're supported by Iran.
Blue guys are the PLC, supported by Saudis. They are anti-Houthi.
The STC, that recently lost, are supported by UAE and Israel.
Currently, UAE + Israel are occupying the Yemeni island of Socotra which gives Israel a major foothold in the Arabian Sea.
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