Erumalu was a city located in Alabasta. Once called the Green City (緑の町,Midori no Machi?), this town was ravaged by the encroaching sea and the extended drought, which was caused by Crocodile's use of Dance Powder.
The inhabitants have long since fled and the buildings are falling apart.
It was home to the Taph Cathedral (タフ大聖堂,Tafu Daiseidō?).