|Mabel and Alexander Graham Bell Way|
|Maintained by Department of Transportation and Infrastructure Renewal|
|Length||141.8 km  (88.1 mi)|
|Existed||1970  –present|
|West end||Hwy 104 (TCH) / Trunk 4 / Trunk 19 near Port Hawkesbury|
|East end|| Marine Atlantic ferry terminal in North Sydney |
continues as Route 1 (TCH) in Newfoundland and Labrador
Highway 105 in Nova Scotia represents the Cape Breton Island leg of the Trans-Canada Highway. It runs from the Port Hastings Rotary just east of the Canso Causeway in Port Hastings to the Marine Atlantic ferry terminal in North Sydney, representing a distance of 142 kilometres (88 mi). 
In 2010, the provincial government named the entire highway Mabel and Alexander Graham Bell Way in honour of Mabel Gardiner Hubbard and her husband Alexander Graham Bell, who resided and are buried at Beinn Bhreagh near Baddeck. 
The highway travels northeast from Port Hastings along the base of a group of mountains known as "The Big Ridge" to Whycocomagh. It then follows the north shore of Bras d'Or Lake, bypassing Baddeck on a short Super two controlled access segment. Still running in a general northeast direction, at St. Anns the highway begins ascending the west slope of Kelly's Mountain on the Cape Dauphin Peninsula. Highway 105 descends the east slope of Kelly's Mountain using a series of sharp turns including a 180° hairpin turn at New Harris Forks before crossing the Great Bras d'Or Channel of Bras d'Or Lake on the Seal Island Bridge. The road crosses Boularderie Island using another short Super two controlled access segment and then runs southeast as an uncontrolled access road through the villages of Bras d'Or and Florence. Highway 105 regains controlled access for the final 3 km (1.9 mi) to its eastern terminus at the Marine Atlantic ferry terminal in North Sydney where travellers can continue to Newfoundland.
With some minor exceptions noted above, the highway is two lanes and uncontrolled access. In addition, there are two intersections controlled by traffic lights in Florence.
The Cabot Trail, which is usually used to describe a different road, is signed along a portion of Highway 105 between Nyanza and St. Anns so that the signed route forms a loop.
Highway 105 is descended from the former Trunk 5, which no longer exists; Highway 105 follows the old Trunk 5 alignment, using present Routes 205, 305 and roads named after it to serve areas bypassed by Highway 105. The 105 name was applied in 1970. 
Trunk 5 was a provincial trunk road in Victoria County and the Cape Breton Regional Municipality between Boularderie East and Millville Boularderie on Boularderie Island in Nova Scotia. The route, known as Millville Highway, was the main highway before Nova Scotia Highway 105 opened. It originally extended from Sydney River to Port Hawkesbury. It is now commonly known as Old Route 5.
|Inverness||Port Hastings||0.0||0.0||1|| Hwy 104 (TCH) west / Trunk 4 west – Canso Causeway, Antigonish |
Trunk 4 east to Hwy 104 east (Fleur-de-lis Trail) – Port Hawkesbury, St. Peter's, Sydney
Trunk 19 north (Ceilidh Trail) – Inverness, Port Hood, Margaree Forks
|Exit 41 on Hwy 104; roundabout;|
Trans-Canada Highway follows Hwy 104 west
|Melford||30.8||19.1||3||River Denys Road||At-grade|
|Iron Mines||42.6||26.5||4||Orangedale Road (Bras d'Or Lakes Scenic Drive)||At-grade|
|Whycocomagh||47.6||29.6||5||Route 252 north to Route 395 – Mabou, Lake Ainslie, Margaree Forks, Chéticamp||At-grade|
|Victoria||Aberdeen||58.6||36.4||6||Route 223 south (Bras d'Or Lakes Scenic Drive) – Little Narrows, Grand Narrows, Iona||At-grade|
|Nyanza||75.7||47.0||7||Cabot Trail (Trunk 30) to Trunk 19 – Margaree Forks, Chéticamp, Inverness||At-grade; unsigned Trunk 30; west end of Cabot Trail concurrency|
|Baddeck||83.7||52.0||8||Route 205 east||At-grade|
|85.6||53.2||9||To Route 205 / Riverside Road|
|MacAulays Hill||94.6||58.8||10||Route 205 west – Baddeck||At-grade|
|St. Anns||103.4||64.2||11||Cabot Trail (Trunk 30) – Ingonish||At-grade; unsigned Trunk 30; east end of Cabot Trail concurrency|
|Englishtown||107.5||66.8||12||Route 312 north – Englishtown Ferry, Ingonish||At-grade|
|Seal Island Bridge crosses Great Bras d'Or Channel (Bras d'Or Lake)|
|Big Bank||120.1||74.6||13||Kempt Head Road (Bras d'Or Lakes Scenic Drive) – Ross Ferry, Kempt Head||At-grade|
|Boularderie East||122.0||75.8||14||Old Trunk 5 – Big Bras d'Or, Black Rock||At-grade|
|Cape Breton||New Dominion||126.3||78.5||15||St. James Road||At-grade|
|Millville Boularderie||132.2||82.1||16||Millville Road – Millville, Big Bras d'Or||At-grade|
|Bras d'Or||134.9||83.8||17||Hwy 162 north (Prince Mine Road)||At-grade|
|135.4||84.1||Hillside Boularderie Road (Bras d'Or Lakes Scenic Drive)||At-grade|
|136.0||84.5||Crosses St. Andrews Channel (Bras d'Or Lake)|
|136.4||84.8||18||Route 305 east / Church Road (Bras d'Or Lakes Scenic Drive) – Alder Point, Georges River||At-grade|
|Sydney Mines||139.1||86.4||20||Hwy 125 east / Main Street – Sydney, Glace Bay, Louisbourg, Sydney Mines||Signed as Exit 20E (east) and 20W (west); exit 1 on Hwy 125|
|North Sydney||141.8||88.1||21||Route 305 (Queen Street) – North Sydney, Sydney Mines|
|North Sydney Ferry Terminal|
|Cabot Strait||Marine Atlantic ferry to Channel-Port aux Basques (year-round) and Argentia (June–September)|
|–||Route 1 (TCH) east – Corner Brook, St. John's||Continues in Newfoundland and Labrador|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
Note: Exit numbers in Nova Scotia are sequential.
Cape Breton Island is an island on the Atlantic coast of North America and part of the province of Nova Scotia, Canada.
The Cabot Trail is a scenic highway on Cape Breton Island in Nova Scotia, Canada. It is a 298 km (185 mi) loop around the northern tip of the island, passing along and through the Cape Breton Highlands and the Cape Breton Highlands National Park.
Baddeck is a village in northeastern Nova Scotia, Canada. It is situated in the centre of Cape Breton, approximately 6 km east of where the Baddeck River empties into Bras d'Or Lake.
St. Peter's is a small incorporated village located on Cape Breton Island in Richmond County, Nova Scotia, Canada.
Boularderie Island is an island separating the Cabot Strait from Bras d'Or Lake on the eastern coast of Cape Breton Island, Nova Scotia, Canada. It takes its name from Louis-Simon le Poupet de la Boularderie, who was granted the area as a concession from the King of France.
Highway 104 in Nova Scotia, Canada, runs from Fort Lawrence at the New Brunswick border near Amherst to River Tillard near St. Peter's. Except for the portion on Cape Breton Island between Port Hawkesbury and St. Peter's, it forms the main route of the Trans-Canada Highway across the province.
Highway 125 is a 28 km long controlled-access highway located in Nova Scotia's Cape Breton Regional Municipality. The provincial government named it Peacekeepers Way on August 18, 2008. Part of the provincial 100-series arterial highway network, Highway 125 encircles the west side of Sydney Harbour, from an interchange with Highway 105 at Sydney Mines to Trunk 4 immediately east of Sydney.
The Seal Island Bridge is a bridge located in Victoria County, Nova Scotia. It is the third longest bridge span in the province.
Highway 162 is a two-lane controlled access highway on Boularderie Island in Nova Scotia, Canada.
Trunk 4 is part of the Canadian province of Nova Scotia's system of Trunk Highways. The route runs from Highway 104 exit 7 near Thomson Station to Glace Bay. Until the construction of the Trans-Canada Highway, Trunk 4 was a major traffic link in northern Nova Scotia and Cape Breton, and is still used on Cape Breton as an alternative to Highway 105. The highway was originally called the King's Highway, however, this name is no longer applied to the entire road. The only remaining historic section of the highway that maintains the name "King" is King's Road in Sydney.
Trunk 19 is part of the Canadian province of Nova Scotia's system of trunk highways. The road runs from Port Hastings to a junction with the Cabot Trail at Margaree Forks on Cape Breton Island, a distance of 107 kilometres (66 mi). Most of the route is known as the Ceilidh Trail.
The 100-Series Highways are a series of arterial highways in the Canadian province of Nova Scotia.
The Bras d'Or Lakes Scenic Drive is a scenic roadway on Nova Scotia's Cape Breton Island. It extends around the perimeter of Bras d'Or Lake.
Route 205 is a collector road in the Canadian province of Nova Scotia.
Route 305 is a collector road in the Canadian province of Nova Scotia.
Port Hastings is a unincorporated settlement on Cape Breton Island, within the Municipality of the County of Inverness, Canada. The population in 2021 was 90.
Beinn Bhreagh is the name of the former estate of Alexander Graham Bell, in Victoria County, Nova Scotia. It refers to a peninsula jutting into Cape Breton Island's scenic Bras d'Or Lake approximately three kilometres southeast of the village of Baddeck, forming the southeastern shore of Baddeck Bay.
Baddeck, Nova Scotia is a village founded in 1908, with a history stretching back to early Mi'kmaq, French and British settlements. The village was home to Alexander Graham Bell and was witness to the first flight in the commonwealth with Bell's Silver Dart.
Baddeck, Nova Scotia is a small resort town on Cape Breton Island, Canada. Some of its tourist attractions include:
The Municipality of the County of Victoria is a county municipality on Cape Breton Island, Nova Scotia, Canada. It provides local government to about 7,000 residents of the eponymous historical county except for the Wagmatcook 1 reserve. The municipal offices are in the village of Baddeck.