Ziggurat of Narvi

From publisher blurb:

As the fledgling adventurers continue their movement throughout the area they begin to head towards the bustling Port City of Kak. To get to there from the Dy’oe Grasslands the party will need to navigate a river running along an overgrown section of the frontier. After obtaining the services of a strange riverboat captain the party heads down the river and into adventure! Between the wildlife, a mysterious old temple, and river pirates the party discovers getting to Kak is easier said than done!

This adventure setting was designed for 5th Edition AD&D for the Filbar Campaign for a lower level group of adventurers and DM. This adventure is easily adaptable to most any game and system.