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Sanaa (Arabic: صَنْعَاء, Ṣanʿāʾ, Yemeni Arabic:; Old South Arabian: 𐩮𐩬𐩲𐩥 Ṣnʿw), also spelled Sana'a and Sana, is the capital and largest city of Yemen and the capital of the Sanaa Governorate. The city is not part of the Governorate but forms the separate administrative district of ʾAmānat al-ʿĀṣimah (أَمَانَة ٱلْعَاصِمَة). According to the Yemeni constitution, Sanaa is the capital of the country, although the seat of the Yemeni government moved to Aden, the former capital of South Yemen, in the aftermath of the Houthi occupation. Aden was declared as the temporary capital by then-president Abdrabbuh Mansur Hadi in March 2015.

At an elevation of 2,300 metres (7,500 ft), Sanaa is one of the highest capital cities in the world and is next to the Sarawat Mountains of Jabal An-Nabi Shu'ayb and Jabal Tiyal, considered to be the highest mountains in the Arabian Peninsula and one of the highest in the region. Sanaa has a population of approximately 3,292,497 (2023), making it Yemen's largest city. As of 2020, the greater Sanaa urban area makes up about 10% of Yemen's total population.

The Old City of Sanaa, a UNESCO World Heritage Site, has a distinctive architectural character, most notably expressed in its multi-story buildings decorated with geometric patterns. In the conflict that raged in 2015, explosives hit UNESCO sites in the old city. The Al Saleh Mosque, the largest in the country, is located in the southern outskirts of the city.

Sanaa has been facing a severe water crisis, with water being drawn from its aquifer three times faster than it is replenished. The city is predicted to run completely out of water by around 2030, making it the first national capital in the world to do so. Access to drinking water is very limited in Sanaa, and there are problems with water quality.