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The bay indents the Avalon Peninsula, opening towards the Atlantic Ocean at its northeast. It is bounded by Cape St. Francis in the south and Split Point near Bay de Verde in the north. It has a maximum depth of 300 metres (980 ft).
Conception Bay covers an area of 1295 square kilometres and contains several islands, the three largest being Bell Island, Little Bell Island and Kellys Island. The Bay is fed by rivers from its east and west, which flow on into the Atlantic Ocean.
The name Conception Bay comes from the Portuguese Baía da Conceição or Baia de Comceica and was presumably given in honour of the Feast of the Immaculate Conception, December 8. The name first appears on the Oliveriana (Pesaro) map of around 1504–1505.
Conception Bay was the site of Britaniola Colony, established in 1610. It was the site of Sea-Forest Plantation founded in 1610 and Bristol's Hope Plantation founded in 1619. During the 1610s, the Bay was the hideout of the infamous Newfoundland based buccaneer, Peter Easton; artifacts from the 17th-century confirmed the presence of Easton and his pirate crew in the Bay, such as Spanish coins, found to be minted in Peru. There was trade between Newfoundland and Bilbao during the 17th century.
From the late 1890s to the 1960s, Bell Island was home to an iron ore mine in Wabana, operated most recently by the Dominion Steel and Coal Corporation (DOSCO). The ore was shipped for processing to DOSCO's steel mill in Sydney, Nova Scotia.
During World War II, anchored DOSCO cargo ships, along with the loading pier at Wabana, were the target of Nazi U-boats on at least two occasions. During one attack on anchored ore carriers, a torpedo missed its target and struck the pier, making Bell Island one of the few places in North America to suffer a direct enemy attack (see Attacks on North America during World War II). The wrecks of the four cargo ships sunk during these two attacks are visible at low tide; a memorial on shore is dedicated to the 69 merchant sailors who lost their lives.
The provincial government operates a passenger-vehicle ferry service from Bell Island to Portugal Cove (on the bay's southeastern shore), operating through what locals know as the "Bell Island Tickle."
Humpback whales have been known to enter the bay while migrating. Private vessels and tourist charters frequent the bay's waters during the summer months.
Property development in the St. John's exurb of Conception Bay South in recent decades has led to increasing recreational use of the bay.
- Workers who have come from Newfoundland to Bell Island for work, disembarking at the beach. c1930
- Picture of Carbonear (Conception Bay), a view from the southside beach, looking west. c 1910
- Do You Remember-Old Conception Bay
- DeJong, Brad; Sanderson, Brian (1994-09-06). "The Circulation and Hydrography of Conception Bay, Newfoundland" (PDF). Department of Physics, Mmeorial University of Newfoundland. Retrieved 2007-11-16.
- Peter E. Pope and Bryn Tapper, "Historic Carbonear, Summer 2013", Provincial Archaeology Office 2013 Archaeology Review, Vol. 12-2013, accessed 24 April 2015
- Mark Rendell, "17th-century coins unearthed in Carbonear", The Telegram, 17 April 2014, accessed 24 April 2015
- "NL Government web site:Bell Island - Portugal Cove Ferry Service". Archived from the original on 2007-08-07. Retrieved 2007-11-16.