When describing the position of something or someone on another object, "sitting on top of" is a commonly used phrase. However, if you're looking for alternatives, some synonyms include "perched on," "resting on," "balanced atop," "occupying the highest spot," "placed above," and "located over." These phrases can add variety to your writing and make it more interesting. Additionally, using different synonyms can help avoid repetition and keep your writing fresh. Whether you're describing a bird on a tree branch or a stack of books on a table, consider using these synonym options to add more descriptive flair to your writing.