Colossal world tree rising from the heart of the earth

An impossibly colossal World Tree rising from the center of the Earth, its trunk thousands of kilometers wide, roots wrapping around entire mountain ranges and disappearing into glowing oceans, gigantic waterfalls cascading from branches the size of continents, floating islands orbiting the crown, tiny ancient cities carved into the bark with warm golden lights, colossal birds soaring through thick clouds for scale, billions of glowing leaves drifting through the sky, dramatic sunrise breaking over the horizon, volumetric god rays piercing the mist, atmospheric depth, cinematic composition, ultra realistic environmental storytelling, National Geographic realism fused with epic fantasy, Unreal Engine 5, Octane Render, physically based rendering, ray-traced global illumination, HDR, breathtaking color grading, perfect perspective, hyper-detailed bark textures, crystal-clear rivers, masterpiece, award-winning concept art, 16K, ultra sharp, no text, no watermark, no logo, no people in foreground