Flag of Vatican City
— the aspect ratio was defined as 1:1 in Article 23 of the 2023 Fundamental Law of Vatican City State — square-shaped — the prior flag of 2001→2023 was, but did not have to be square-shaped. [1]
Wiphala
— the aspect ratio is 1:1 — square-shaped — with implied 13 diagonals of squares in a rainbow pattern of seven colours in a seven-by-seven square
Flag of France
— the aspect ratio is 2:3, one of the most common and conventional aspect ratios for national flags
Flag of Togo
— the aspect ratio is of Fibonacci's golden ratio that is approximately 1:1.618 ≈ 13:21
Flag of El Salvador
— the aspect ratio is 189:335 ≈ 1:1.772
(government/state flag — civil flag is without the arms)
Flag of Qatar
— the largest aspect ratio of any national flag — being over 2½ times as long as the height — of 11:28 ≈ 1:2.545
Flag of the Republic of Venice / The Banner of Saint Mark the Evangelist
— an oblong flag with six fringes also serve to prevent damage being caused to the central section of the flag by wind. [2]
( La Serenissima / Stato da Màr — 697→1797)- Flag of Venice
— an oblong flag with six fringes in a simplified variation of the Banner of Saint Mark, but still highly decorated orle bordered with insets of the Madonna and Child with Christian saints
(from 1997 — the City of Venice)
Flag of Denmark
— a swallowtail shape particular to Nordic nations
(government/state flag only — civil flag is oblong)
Flag of Iceland
— a swallowtail shape particular to Nordic nations
(government/state flag only — civil flag is oblong)
Raven banner
— a swallowtail shape particular to Nordic nations
(government/state flag only — civil flag is oblong)
Flag of Ohio
— a non-rectangular guidon (burgee) form — the only U.S. state flag not rectangular — with a proportion of 8:13
Flag of Nepal
— currently the only non-rectangular national civil flag — being made with 5 sides — and the only one that is taller than wide, with the bordering aspect ratio of ≈ 6:5