Table schema:
CREATE TABLE table_26769_1 (country_or_territory_with_flag VARCHAR, population_density_per_km² VARCHAR)

Question: 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)"