The Strait depth extends to on the shortest route, although it is only about 300 metres deep slightly further west, in a region known as the Camarinal Sill; the European and African tectonic plates meet around this area. The shortest crossing is . The proposed route of is west of Tarifa and to the east of Tangier. The tunnel is likely to be about in all. It is proposed that a connection would have to be made to the Spanish high speed railway network, which has a line projected to be built from Cádiz to Málaga via Algeciras.