The prospective MP for Argyll, Bute and South Highlands would have to cover an area from Fort William to Campbeltown and include 23 islands.
Argyll and Bute MP Brendan O’Hara has pledged to vote against the Boundary Commission proposal to cut Scotland’s elected representatives at Westminster from 59 to 53, should it come before parliament.
The plan, released earlier this week, cuts the number of Highlands and Islands MPs from four to three and extends the current Argyll and Bute boundary north to take in Fort William, increasing the size of an already massive constituency by almost a third.