CREATE TABLE table_26769_1 (country_or_territory_with_flag VARCHAR(255), population_density_per_km² VARCHAR(255))
What was the country with a population density per km² of 3.5/km² (/sqmi)?
    
SQL: SELECT country_or_territory_with_flag FROM table_26769_1 WHERE population_density_per_km² = "3.5/km² (/sqmi)"