The TRANSMED Atlas, a CD-ROM-and-book package, provides an unprecedented overview of the geological and geophysical characteristics of the Mediterranean region. By integrating new and pre-existing data on surface geology, seismic profiles and mantle tomography (on land and at sea), it combines the efforts of sixty-two structural geologists, geophysicists, marine geologists, petrologists, sedimentologists, stratigraphers, paleo-geographers and petroleum geologists coming from eighteen countries and working for the petroleum industry, academia and other private and public institutions. The CD-ROM includes sixteen lithospheric transects across the Mediterranean region and adjacent areas. Each transect includes explanatory text with figures plus a series of clickable insets (seismic lines, well logs, litho-chrono-stratigraphic charts, paleo-geographic reconstructions, detailed maps, etc.) providing data in support of the interpretation shown in the transects.