: As the largest academic library in the world, Harvard's system comprises over 70 locations. Its centerpiece, the Widener Library , is the heart of a network that includes 400 million manuscript items and 10 million photographs. It is a pioneer in open access through the Harvard Digital Collections. 2. University of California Library System

University libraries serve as the intellectual vaults of the world. While public libraries like the Library of Congress or the British Library are larger, university libraries hold the distinction of being the primary research hubs for scholars, students, and historians.

These are the "oceans" of academia. You cannot walk through them in a lifetime. However, our "better" ranking looks at how they manage that mass.