Madragar (Stormforge Supplement)
From D&D Wiki
This island off the southwestern shores of Aerinthia dominated by steaming jungles, ancient ruins, fetid swamps, and raging rivers. Haven is the only major settlement on Madragar not ruled by the Lizardfolk. The jungles of Madragar hide multiple tribes of Lizardmen, and a constant war is fought between these tribes. Many of the Lizardman tribes worship Sissthus, as a reptilian goddess of pain and bloodlust.