Gorringe Ridge
Portugal
The Gorringe Ridge is a seamount in the Atlantic Ocean. It is located about 210 kilometres (110 nmi, 130 mi) west of Portugal, between the Azores and the Strait of Gibraltar along the Azores–Gibraltar fault zone. It is about 60 kilometres (32 nmi, 37 mi) wide and 180 kilometres (97 nmi, 110 mi) long in the northeast direction. It is, since 2015, a marine protected area of Portugal included in the Natura 2000 program. If measured from the bottom of the Tagus Abyssal Plain, the ridge would measure more than 5,000 m (16, 400 ft) in height, which would make it Portugal's highest mountain.
NatureReserve data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).