Question: What is the approximate area of this country where Lobelia columnaris can be found (other than Cameroon)?
Sentence (from "Equatorial Guinea"): Equatorial Guinea (Spanish: "Guinea Ecuatorial" , French: "Guinée équatoriale" , Portuguese: "Guiné Equatorial" ), officially the Republic of Equatorial Guinea (Spanish: "República de Guinea Ecuatorial" , French: "République de Guinée équatoriale" , Portuguese: "República da Guiné Equatorial" ), is a country located in Central Africa, with an area of 28000 km2 .
Relevant evidence: Yes