The Avalon Peninsula is a large peninsula (9,220 km²) that makes up the southeast portion of the island of Newfoundland.
The peninsula is home to 262,410 people, about 51% of Newfoundland's population, according to the Canada 2011 Census. The peninsula is the location of St. John's, the provincial capital and largest city. It is connected to the main section of the island by the 5 km (3 mi) wide Isthmus of Avalon. The peninsula protrudes into the rich fishing zones near the Grand Banks. Its four major bays—Trinity Bay, Conception Bay, St. Mary's Bay, and Placentia Bay—have long been the centre of Newfoundland's fishing industry.
The Avalon Peninsula is itself pinched into peninsulas by St. Mary's Bay and Conception Bay. St. John's is located in the northeast of the peninsula.
The Avalon Peninsula is a noted region for Precambrian fossils, and many Lagerstätten of the diverse Ediacaran biota are found on the peninsula. Mistaken Point is the original location of the first documented Ediacaran, Aspidella terranovica (which gets its specific name from Newfoundland). The peninsula gives its name to the ancient micro-continent Avalonia of which it was part.
Explorer John Cabot led an unsuccessful expedition from England to try and reach the Banda Islands in The Orient, supposedly ended up off what is now Bonavista. The first permanent English settlement was established at Cuper's Cove in 1610. Sir George Calvert was later given a large land holding on the peninsula. The initial colony of Ferryland grew to a population of 100, becoming the first successful permanent settlement on Newfoundland island. In 1623 Calvert was given a Royal Charter extending the Royal lands and granting them the name Province of Avalon "in imitation of Old Avalon in Somersetshire wherein Glassenbury stands, the first fruits of Christianity in Britain as the other was in that party of America". Calvert wished to make the colony a refuge for Roman Catholics facing persecution in England. In 1625 Calvert was made the first Lord Baltimore.