Babylon Imagery
The rastaman sees the physical world as irredeemably corrupt in its entirety. He uses the imagery of Babylon, the Biblical "city of Man," to represent the world. It's an apt image: Babylon is famous for being morally corrupt and extravagantly indulgent in pagan luxuries and pleasures, and that pretty well describes the world. This imagery implies the rastaman's hope in a better, supernatural world for the future.
Zion Imagery
The imagery of Zion is also prevalent in this work. Zion is a traditional name for heaven, and both the cartographer and the rastaman are attempting to find Zion in their own ways. The idea of Zion is therefore presented as a sort of achievable Holy Grail symbol, the end of life and the fulfillment of all man's desires. It's elusive, though, and the imagery surrounding it understandably makes it seem supernatural.
Jamaican Imagery
The action of this book is set primarily in Jamaica, where the rastaman calls home. Accordingly, there is much imagery relating to the country. There are many poems dedicated to describing various places throughout the country and their anthropological histories. Miller also uses extensive bits of Jamaican patois in order to realistically evoke the setting, an effective tool for lending authenticity to one's imagery.
Nature Imagery
Much of this book is concerned with the natural world, and several poems are dedicated to describing various aspects of it. For example, the poem "A Prayer for the Unflummoxed Beaver" describes a tranquil pastoral of a boat in a river, along with the flora, fauna, and inanimate inhabitants of the scene. Other such poems include "A Ghazal for the Tethered Goats" and "For the Croaking Lizards."
