It was once unchartered wild terrain. Now, we can zoom in on the details of each river, stream, and the tributaries that feed them. North America’s waterways and lakes are the focus of this Hydrological map, with each determined by its Strahler number, which defines its size based on the hierarchy of tributaries. The maps are produced on a 12-color gicleé printer using premium inks for intricately detailed, fade-free visuals. The museum-quality maps are printed in the USA and certified to last 100 years.