Bull Arm is a natural arm

Arm (geography)

In geography, an arm is a narrow extension, inlet, or smaller reach, of water from a much larger body of water, like an ocean, sea, or lake. Although different geographically, a sound or bay may be called an arm....

 of approximately 10 miles in length and average of 1 mile wide located at the Isthmus of Avalon on the Avalon Peninsula

Avalon Peninsula

The Avalon Peninsula is a large peninsula that makes up the southeast portion of the island of Newfoundland.The peninsula is home to 257,223 people, which is approximately 51% of Newfoundland's population in 2009, and is the location of the provincial capital, St. John's. It is connected to the...

 in the Canadian

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

 province

Province

A province is a territorial unit, almost always an administrative division, within a country or state.-Etymology:The English word "province" is attested since about 1330 and derives from the 13th-century Old French "province," which itself comes from the Latin word "provincia," which referred to...

 of Newfoundland and Labrador

Newfoundland and Labrador

Newfoundland and Labrador is the easternmost province of Canada. Situated in the country's Atlantic region, it incorporates the island of Newfoundland and mainland Labrador with a combined area of . As of April 2011, the province's estimated population is 508,400...

. The inner reaches of the arm is located at Sunnyside

Sunnyside, Newfoundland and Labrador

Sunnyside is a town on the Avalon Peninsula in Newfoundland and Labrador, Canada. It is in Division No. 1 on Bull Arm.According to the 2001 Statistics Canada Census:*Population: 477*% Change : -23.2*Dwellings: 249*Area : 37.95...

, and from there it is a mere 2.72 miles to Placentia Bay

Placentia Bay

Placentia Bay is a body of water on the southeast coast of Newfoundland, Canada. It is formed by Burin Peninsula on the west and Avalon Peninsula on the east. Fishing grounds in the bay were used by native people long before the first European fishermen arrived in the 16th century. For a time, the...

 at Come by Chance

Come By Chance, Newfoundland and Labrador

Come By Chance is a town on the Avalon Peninsula in Newfoundland and Labrador, Canada. It is in Division No. 1 on Placentia Bay.Located in this town is Newfoundland's only oil refinery, the Come By Chance Refinery operated by North Atlantic Refining Company, which has a capacity of .According to...

.

Located at Bull Arm is the Bull Arm Fabrication Site, where the construction of the Hibernia

Hibernia (oil field)

Hibernia is an oil field in the North Atlantic Ocean, approximately east-southeast of St. John's, Newfoundland, Canada.The production platform Hibernia is the world's largest oil platform and consists of a 37,000-tonne integrated topsides facility mounted on a 600,000-tonne gravity base structure...

 gravity base structure

Gravity base structure

A gravity-based structure is a support structure held in place by gravity. A common application for a GBS is an offshore oil platform. These structures are often constructed in fjords since their protected area and sufficient depth are very desirable for construction...

 took place at Bull Arm. The area was chosen due to its natural deep channel to Trinity Bay

Trinity Bay, Newfoundland and Labrador

Trinity Bay is a large bay on the northeastern coast of Newfoundland in the Canadian province of Newfoundland and Labrador.Major fishing communities include Trinity and Heart's Content.-Industry:...

and its calm waters in the arm.