The seed takes you to a jungle, and at coordinates 480 ~ -280 there is a modified jungle edge, the rarest biome in the game. IT is also not between a modified jungle and swamp hills, but is 100% the biome required.
Today I stumbled upon another modified jungle edge, on the edge of swamp hills, at coordinates -6032 89 -2352. And, unlike the first JEM, which I found with the help of a seed, this one was my own discovery. I am still sitting here in shock that I found it. It is listed as 'Extremely rare' in a biomes list, the only one to do so.
See the attached photographs for both of them. Whilst the second may not be large, it is good cliffs. And nearby I found an interesting 'crater lake'.
But the first is GIGANTIC. It comes in two parts separated by a thin jungle.
I recommend this seed, it is the best I have ever played on. And I had no idea 2 extremely rare biomes would be so close to each other!!
JEM1 is the jungle edge in the seed. JEM2 is the discovered one. For those interested, there is also a tall birch forest at 789 69 -5233
I recommend this seed to everyone, and massive credit to OMGcraft for providing the seed!
This seed is better for JEM than for mansions, the nearest one to spawn is more than 20000 blocks away!
On the same -8029928066082808481 seed, the biggest mega taiga I have ever seen has also been found.
The forest starts at -24555 63 -29868. The mega taiga is rare on its own- much rarer than a jungle, but this massive forest is also home to one of the rarest biomes in minecraft, and the first time I encounter it: giant spruce taiga.
Images of all and coordinates are attached below. I can't believe I found them. Now, a very cumbersome attempt is being made to map the entire forest.
After this, the only biomes left are ice spikes, mushroom island (hoping for a landlocked one), badlands, and snowy taiga mountains out of the very rare ones. I am also looking for shattered savanna simply because it looks awesome. The forest appears to stretch over a thousand blocks in the northeastern direction. It is almost completely mega taiga save for very small mega spruce taiga parts, or mega taiga hills.