The West Australian election on March 11 will be the first fought under fresh electoral boundaries drawn in a 2015 redistribution.

There are three new seats up for grabs in the election — Baldivis, Bicton and Roe — while another has been abolished and some have new names.

What boundary changes?

Baldivis was created from sections of Labor-held Kwinana and Warnbro, making it a nominally Labor seat with a 6.4 per cent margin

Baldivis was created from sections of Labor-held Kwinana and Warnbro, making it a nominally Labor seat with a 6.4 per cent margin The seat of Bicton takes Attadale and Bicton from the former seat of Alfred Cove. It's a Liberal seat with a 10 per cent margin

The seat of Bicton takes Attadale and Bicton from the former seat of Alfred Cove. It's a Liberal seat with a 10 per cent margin Roe takes in the centres of Esperance, Katanning and Kojonup. It takes part of the former seats of Eyre and Wagin and is nominally the WA Nationals' safest seat, with a hefty 27.6 per cent buffer

Why was one seat abolished?

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Perth's big population growth between the 2011 and 2015 boundary changes meant the city needed a new Lower House seat, with the WA Electoral Commission (WAEC) identifying the fast-growing area of Baldivis.

But to avoid expanding the 59-seat Legislative Assembly, the WAEC chose to abolish a country electorate — the seat of Eyre held by Liberal Graham Jacobs.

Why do some seats have new names?

Electorates are often named after their key population centres.

But under the redistribution, the boundaries of electorates such as Alfred Cove, Gosnells and Ocean Reef no longer fully contain the suburbs they were named after.

Their new names of, respectively, Bicton, Thornlie and Burns Beach better reflect their central areas.

Wagin has been renamed for the same geographical reason, but its new name of Roe is a nod to its history. There have been two previous electorates called Roe, recognising the achievements of colonial explorer Sir John Septimus Roe.

How do I know which seat I'm in?

You can check by entering your enrolment details at the Western Australian Electoral Commission website.

Alternatively, take a look at the new WA electoral boundaries at the website of the Office of the Electoral Distribution Commissioners.

What do the changes mean for the parties?

Labor frontbencher Rita Saffioti's seat of West Swan is now nominally Liberal. ( ABC News: Andrew O'Connor )

They made Labor's fight to win the 30 seats to form government harder.

Labor was the biggest net loser of the redistribution, seeing two of its seats (Collie-Preston, held by Mick Murray, and West Swan, held by Rita Saffioti) becoming nominally Liberal, although it gained Baldivis.

While the Liberals lost Eyre, they also made a net gain of one seat by taking the two Labor seats.

There was no net change to the number of seats held by the WA Nationals.

How about for the politicians?

Voting patterns at the last WA election suggest that many MPs will have a much tougher fight as a result of the redistribution.

Of course, there are many unknown factors which will affect votes at the election, from the calibre of candidates to the size of the swing against the State Government to the influence of One Nation and micro parties.

But looking at ABC election analyst Antony Green's redistribution calculator, the numbers are tight for some.

Losers:

Liberal Matt Taylor, who lost preselection in his seat of Bateman and will instead stand in Bicton, where the margin fell from 23.6 per cent to 10 per cent

Liberal Matt Taylor, who lost preselection in his seat of Bateman and will instead stand in Bicton, where the margin fell from 23.6 per cent to 10 per cent Liberal Peter Abetz (Southern River) whose margin fell from 17 per cent to 10.9 per cent

Liberal Peter Abetz (Southern River) whose margin fell from 17 per cent to 10.9 per cent Liberal Albert Jacob, the Environment Minister, whose margin drops from 19 per cent to 11.3 per cent in Burns Beach

Liberal Albert Jacob, the Environment Minister, whose margin drops from 19 per cent to 11.3 per cent in Burns Beach Labor's Peter Tinley (Willagee) whose margin fell from 10.6 per cent to 2.5 per cent

Labor's Peter Tinley (Willagee) whose margin fell from 10.6 per cent to 2.5 per cent Labor's Peter Watson whose margin fell halved from 2 per cent to 1 per cent in Albany

Winners: