Question: How many kilometers long is the highway immediately north of Swanport?

Context paragraphs:
Diveagar: Diveagar (Dive Agar) is a village located in Shrivardhan Taluka, Raigad district in the Indian state of Maharashtra, approximately 170 kilometers south of Mumbai. The area is peaceful, clean and sparsely populated.  The region includes a fishing settlement, a beach, a temple, local businesses engaged in coconut and beetle nut tree farming, and some tourism businesses such as restaurants, cottage rentals and hotels, and six villages (from north to south): Velās, Musalmāndi, Agar Panchaitan, Diveagar, Borlai Panchaitan, and Kārle.  The beach, facing the Arabian Sea, is approximately four kilometers long and undeveloped.  At the north end of the beach where a small stream enters the ocean there is the fishing settlement, Velas Agar, and some paddy farming, while at the south end there is a sanctuary for migratory seabirds.  Nearby, there is a small fishing village, where vendors sell fresh fish, which goes by name of Bharadkhol.  The beach is accessible from the Mumbai-Goa highway via Kolad or Karnala.

Hummock Range: The Hummocks or Hummock Range is a range of hills in the northern Mount Lofty Ranges extending north from the eastern edge of Yorke Peninsula in South Australia.  It is traversed by the Copper Coast Highway immediately west of where it passes around the northern end of Gulf St Vincent.  The Augusta Highway passes to the east of the Hummocks.  The Hummock Range includes the settlements of South Hummocks and Kulpara.  Towards the range's northern end it continues as the Barunga Range north of Barunga Gap, approximately 10 km south west of Snowtown.

Palmason Model: The Palmason Model is a depth, distance, temperature and heat flow gradient model of crustal accretion mechanism through the Iceland lithosphere which denotes the spreading material trajectories from a rift axis.  The material erupting at the rift axis will tend to sink down, due to thermal subsidience and spreading, to a depth of many kilometers, while lava flows spreading to a distance of many kilometers away from the rift axis on the surface will sink down to shallower depth.  Surface erosion can expose such preserved materials.

Iro Lake: Iro Lake (French: "Lac Iro" ) is a cyclically occurring lake in the Moyen-Chari Region in southeastern Chad.  It is fed in the summer and autumn months from the eastern arm of the Bahr Salamat, which forks seven kilometers southwest of the lake.  The lake is about 100 kilometers north of the border with the Central African Republic.  It is nearly circular, 13 kilometers long and 11 kilometers wide.  During the dry season it can completely run dry.

Puerto Rico Highway 185: Puerto Rico Highway 185 is a main highway that connects Canóvanas, Puerto Rico to Juncos, Puerto Rico and is about 25 kilometers long.  It begins in downtown of Canóvanas, very close to Puerto Rico Highway 3 and ends in Puerto Rico Highway 952 and Puerto Rico Highway 30 in Juncos.  For people coming from/going to Caguas, the highway has a direct intersection with PR-30; for those coming from/going to Humacao, drivers have to take short highway PR-952 and then take PR-189 just before its intersection with PR-30, hence this exit being one of the most disorganized junctions in the island between a main highway and a main freeway or tollway in the island.  New Puerto Rico Highway 66 also has a poor-designed intersection with the highway, since it only allow people going to/coming from Carolina (west) and not the east.  This is probably because the short segment open from the new tollway immediately ends at PR-3 only 2 kilometers from the exit to PR-185 and thus expected to be fixed when the segment to Rio Grande opens to the public.

Swanport, South Australia: Swanport, also formerly known as Thompson's Crossing and Thomson's Landing, is a suburban satellite locality of Murray Bridge in South Australia on the west (right) bank of the Murray River adjacent to Swanport Bridge.  Its boundaries were formalised in March 2000 to cover a portion of semi-urban land immediately south of the South Eastern Freeway adjacent to the Swanport Bridge, which is the main road freight route over the Murray.  It is named for the docking place on the west bank of the Murray which was home to "numerous swans" and also known as Thomson's Landing.

Fissure vent: A fissure vent, also known as a volcanic fissure or eruption fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity.  The vent is often a few meters wide and may be many kilometers long.  Fissure vents can cause large flood basalts which run first in lava channels and later in lava tubes.  After some time the eruption builds up spatter resp.  ash cones and may concentrate on one or some of them.  Small fissure vents may not be easily discernible from the air, but the crater rows (see Laki) or the canyons (see Eldgjá) built up by some of them are.

Siju Cave: Siju Cave is located in Meghalaya state near Naphak Lane and Simsang River game reserve.  It is a limestone cave.  The Cave is filled with water and is many kilometers long.  It is considered as the third longest cave system in India.  In 1927 it was found that the caves have a temperature of 21–26.4 °C.

Cole Peninsula: Cole Peninsula ( ) is a peninsula, 24 kilometers long in an east-west direction and 13 kilometers wide, lying between Cabinet Inlet and Mill Inlet on the east coast of Graham Land, just east of Thuronyi Bluff and immediately north of the Antarctic Circle.  The peninsula is surrounded by the Larsen Ice Shelf, which is part of the Weddell Sea.

South Eastern Freeway: The South Eastern Freeway (previously signposted as Princes Highway) is a 76 kilometre controlled-access highway in South Australia.  It carries traffic over the Adelaide Hills between Adelaide and the River Murray, near Murray Bridge, connecting via the Swanport Bridge to the Dukes Highway which is the main road route to Victoria.  It is often referred to by South Australians simply as "the Freeway", as it was the first freeway in South Australia, and is still the longest, and the only one with "Freeway" in its name rather than "Expressway" or "Highway".  It is a part of the National Highway network linking the state capital cities Adelaide to Melbourne and signed as National Highway M1.  The South Eastern Freeway includes 500-metre-long twin-tube tunnels (the Heysen Tunnels) in the descent towards Adelaide, the first of their kind on the National Highway.  It is designated as the M1.

Supporting paragraphs: Swanport, South Australia South Eastern Freeway
Answer: 76