Corsica and killings culminated in the assassination of Prefect Claude Érignac in 1998. In 2013, Corsica hosted the first three stages of the 100th Tour de France, which passed through the island for the first time in the event's 110-year history. Corsica was formed about 250 million years ago with the uplift of a granite backbone on the western side. About 50 million years ago sedimentary rock was pressed against this granite, forming the schists of the eastern side. It is the most mountainous island in the Mediterranean, a "mountain in the sea". It is also the fourth largest island in
Ancient Corsica the strait separating the island from Sardinia to the south was the "Fretum Gallicum". The location of the island between the Italian mainland to the east, the Gallic mainland to the north, and Sardinia to the south, made Corsica an important strategic point for control of the western Mediterranean sea. Additionally, the island was a significant hub of Mediterranean trade. Corsica was described by Theophrastus as thickly wooded and mountainous. Only the flat, coastal area was suitable for agriculture - especially the space around Aleria on the east coast - the island mainly produced timber and raw materials like copper,