The 1755 Lisbon earthquake, also known as the Great Lisbon earthquake, hit the Iberian Peninsula and Northwest Africa on the morning of Saturday, 1 November, Feast of All Saints, at around 09:40 local time. In combination with subsequent fires and a tsunami, the earthquake almost completely destroyed Lisbon and adjoining areas. Seismologists estimate the Lisbon earthquake had a magnitude of 7.7 or greater on the moment magnitude scale, with its epicenter in the Atlantic Ocean about 200 km west-southwest of Cape St. Vincent, a cape in the Algarve region, and about 290 km southwest of Lisbon.