The country that matches these properties is Belize 🇧🇿
- Without the clue "Its flag contains yellow", other countries are: Norway, Oman, Australia, and 3 more
- Without the clue "Has a population density less than 20 people/km²", other countries are: Papua New Guinea, Liechtenstein, Malaysia, and 17 more
- Without the clue "Is a monarchy", other countries are: Mali, Guyana, Central African Republic, and 13 more