The Tawila Tanks, also known as 'Aden Tanks', the 'Cisterns', 'Queen of Sheba Tanks' or 'Solomon's Tanks', are located at the head of Tawila Valley in the southwest sector of Crater. They are considered one of the greatest historical engineering feats in South Arabia, likely built and developed during the rules of Banu Zuraia’, the Roulades, the Tahirides and the Ottomans and mentioned in the ancient Al- Musnad inscriptions. However, not much is accurately known of their history.