Which is the only country that has a flag consisting of just one colour?
Flag of Libya after the Egyptian Revolution of 1952 (which also formed the basis of the flags of Egypt, Iraq, Syria, and Yemen). In 1972 when Libya joined the Federation of Arab Republics its flag was adopted by the country, linking it to Egypt and Syria. It featured a golden hawk (the "Hawk of Qureish"), holding a scroll with the Arabic name of the Federation. The flag of the Libyan Arab Jamahiriya was adopted on 11 November 1977 and consisted of a green field. It was the only national flag in the world with just one colour and no design, insignia, or other
Flag of the Black Country flag are: The Flag is one of very few regional, non-historic county, flags that may be flown without consent of a local planning authority, providing the flag is "maintained in a condition that does not impair the overall visual appearance of the site" and does not block official signs (such as road signs). In 2013, on Black Country Day (14 July), the Black Country flag was flown alongside the United Kingdom’s Union flag, at Eland House, the head quarters of the Department for Communities and Local Government in Victoria, London. Flag of the Black Country The Black Country flag is