Searching For A Medieval Mapmap

Hey guys! I'm willing to start a big medieval world. But as you might know the default Minecraft maps sucks.
So I was wondering if one of you guys could help me find or make me a custom map. Some of you might not
be builders. For those people its hard to imagine what kind of maps builders like me are searching for.
Like I said, I want to build a medieval world. (Also known as the middle ages: https://en.wikipedia.org/wiki/Middle_Ages).
This is like years and years ago. So there is much green on the planet. Beside that the map must be buildable.
Maps with lots of high mountains or many switching levels are very hard to build on. (See pictures below to understand what kind
of environment I'm searching for). I hope you guys are willing to help me!

report Custom map requirements report

- Realistic terrain
- At least 10K x 10K
- Many buildable places
- There must be mountains in it but not to many of them
- (not necessary) Ores
- Rivers (I would love small realistic rivers)
- Sea
- Islands
- Many different biomes (May also be (realistic) custom biomes to)
- Good looking trees (May also be schematics from PlanetMinecraft ect)

If you've any questions about the map feel free to leave a comment or contact me.
~ MightAndGlory©