Lonely Planet
Lonely planet.com: Color Map of Nicaragua
This site has a great full color map of Nicaragua complete with cities, rivers and lakes detailed. Or you can choose the "zoom out" feature and see all of Central America and the Caribbean.
Geographyiq
Geography Iq: Nicaragua
A detailed and exhaustive resource for finding much information on Nicaraqua. Organized by quick facts in chart form or longer commentaries.
Other
Nicaragua's Towns,cities, Rivers and Roads on Maps.
See a large map of Nicaragua, then choose any city, town, or waterway, and see it on a map too. The entire country at your finger-tips!
Climate Zone
Climate Zone: Climate of Nicaragua
A guide to information about the weather of Nicaragua displayed in tables featuring average monthly temperature, rainfall, and snow days. Also included is a detailed map.