Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Valais Ocean is a disappeared piece of oceanic crust which was situated between the continent Europe and the microcontinent Iberia or so called Briançonnais microcontinent. The Valais Ocean is together with other small disappeared oceanic basins often called the Alpine or Western Tethys Ocean.After the breakup of Pangaea in the early Mesozoic age the continents Africa, South America, Europe and North America began to move away from each other. The breaking up or rifting was not a process that happened along one clear line. At the southern edge of the European plate the microcontinent Iberia began also to break away from Europe. In the western part of the rift that separated the two landmasses oceanic crust was formed in what is at present the Gulf of Biscay, while in the eastern part the Valais Ocean was formed.