This is the flag of Oryxia, which is a fictional country I made up to be the center of the "Rimpalaverse" (ie the world Rimpala, Halapmyr and others reside in). It'll be most notable as being the nation the Rimpala family is from. This is part of my re-imagining of my original fursona, Rimpala, in fact.

It's description is a bit of a work in progress but it's a central European country, possibly around where Slovakia resides, that has a mixed population of antelopes and goat species due to a migration during the era of the Roman empire. The nation has, at times, been apart of the Austrian Empire, and has been under control of Germany during both world wars, but has otherwise been it's own entity. The government is on paper a consitutional monarchy, but has throughout it's history experimented with being a magoarchy and later a technocracy. The capital is Macam.

There's a lot more to explain, but the country is also going to be part of  ME262 's world, being a neighbor of Materia.