Currently, rivers generate with the same water level as all ocean biomes in the world. However, in real life, rivers move downhill towards larger bodies of water. Rivers should start in mountain biomes, narrower and at a much higher y-level. Along rivers, waterfalls could generate in order for the river to travel downward. These waterfalls could also be a variant of the river biome, where fish such as salmon can spawn more frequently. This could add more interesting generation to Minecraft worlds, and make the game more realistic.
Also to make rivers more realistic, maybe water blocks in the river biome could have a slightly different animation, so that they appear to be flowing more, but without actually being a flowing water block.
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