The Quantill City harbor was located on the planet Ando.
It was targeted by Pyash Yopayomba to start a planetary civil war during the Portage Moon Festival. Her plans were foiled when Sissalik took control of the explosive-laden Nanda's Luck and rammed it into her ship instead of the harbor.
Sources
Ando: Planet of the Walrus Men on Wizards.com (backup link) (original site is defunct)
In other languages