Blain is an urban electorate, covering 18 km² and taking in the Palmerston suburbs of Moulden, Woodroffe, Zuccoli and the western half of Rosebery.
Rosebery was named after Archibald Phillip Primrose, the fifth Earl of Rosebery, Prime Minister of the United Kingdom in 1894–95.
Archibald Primrose, 5th Earl of Rosebery | Rosebery | Earl of Rosebery | Rosebery, Northern Territory | Harry Primrose, 6th Earl of Rosebery |
Rosebery was notable in horseracing circles for winning the Epsom Derby with Blue Peter and Ocean Swell, and winning most other classic British flat races, with horses bred at his Mentmore and Crafton Studs.
Other internment centres in the Slocan region were nearby, at New Denver, Slocan City, Rosebery, Kaslo and Sandon.