TASFlag  TASMap  Tasmania Coastline and State Boundary Comparison

  Data sourced from Geoscience Australia (GEODATA Coast 100K 2004 database, GDA_1994_Australia_Albers projection).
What "coastline length" actually means:
Coastline length isn't a fixed number — it depends on the scale of the map used to measure it (the classic "coastline paradox"). The more detailed the map, the more every inlet, bay and headland gets counted, and the longer the total becomes. All figures below use the same Geoscience Australia measurement standard, so they're directly comparable to each other, even though you may see different (usually bigger) totals quoted elsewhere.
State / Territory Land Border Mainland Coast Island Coast Total Coastline
Australia (national total) — 35,821 km 23,860 km 59,681 km
#1 WAWA mapWestern Australia 1,874 km 12,895 km 7,894 km 20,788 km
#2 QLDQLD mapQueensland 3,337 km 6,967 km 6,385 km 13,352 km
#3 NTNT mapNorthern Territory 3,180 km 5,438 km 5,516 km 10,954 km
#4 SASA mapSouth Australia 3,187 km 3,815 km 1,244 km 5,059 km
#5 TASTAS mapTasmania none (island) 2,827 km 2,046 km 4,872 km
#6 VICVIC mapVictoria 2,550 km 1,870 km 645 km 2,515 km
#7 NSWNSW mapNew South Wales 4,625 km 1,973 km 128 km 2,101 km
Source: Geoscience Australia – GEODATA Coast 100K 2004 database
  The Australian Capital Territory isn't listed above as it's the only landlocked state or territory in Australia, with no coastline of its own. Its sole sea access is via the separate Jervis Bay Territory — a small Commonwealth-administered enclave on the NSW coast — which has its own tiny coastline of about 36 km and a 32 km land border with NSW.
Punching above its weight:
Tasmania is Australia's smallest state by land area, yet it has a longer total coastline than both Victoria and New South Wales — two much bigger states. That's largely down to roughly 2,046 km of island coastline from King Island, Flinders Island, Bruny Island, Maria Island and the hundreds of smaller islands scattered through Bass Strait and around the main landmass.
Tasmania has no land border figure:
It's the only island state in Australia, so unlike every mainland state it has zero kilometres of land border with a neighbour — its entire boundary is coastline. Compare that to New South Wales, which has the longest land border of any state at 4,625 km, shared with Queensland, South Australia, Victoria, the ACT and the Jervis Bay Territory.
Why island coastline matters so much:
Almost 40% of Australia's entire coastline length comes from islands rather than the mainland edge. The Northern Territory is a standout example — it's the only jurisdiction where the combined coastline of its islands is longer than its mainland coastline.
Western Australia is in a league of its own:
At 20,788 km of total coastline, WA alone accounts for roughly a third of Australia's entire coastline — more than four times Tasmania's total, despite Tasmania having the higher coastline-to-land-area ratio of any state.

Note: Figures for total Australian coastline vary between sources depending on measurement scale and methodology — the CIA World Factbook's continental-only estimate (25,760 km) and the World Resources Institute's fine-scale estimate (66,530 km) are both commonly quoted elsewhere. This page uses Geoscience Australia's official state-by-state measurement standard for consistency.
Script courtesy of : Tony @ Beaumaris Weather | © Beaumaris-Weather.com | Version 1.0.0
Data courtesy of Geoscience Australia.