Ohmallera
Ohmallera was a city on Betazed. It was once home to 1.2 million people and was renowned on the planet for its state-of-the-art medical facilities and doctors, especially in the fields of psychiatry, endocrinology, and neurology.
Unfortunately, the city's distinction as a premier healthcare center made it a target for Armeni, a former psychiatric patient at one of the city's hospitals. After hijacking the USS Constitution-B in 2388, Armeni used the ship to launch an attack, destroying the Betazoid metropolis.