Sićevo gorge is a big, long, and narrow space that's like a crack between two big rocks. It's in a country called Serbia, in the middle of Europe.
A long time ago, there was a big river that flowed through this space and made it deeper and wider. That's why it's called a gorge.
Now, people can visit this gorge and see how the river made the rocks so pretty and special. Sometimes, people even go on long walks through the gorge to see all the cool things that nature made.
But because it's a bit narrow, people have to be careful when walking through it. And they need to make sure they don't litter or do anything to hurt the pretty plants and animals that live there.