* Land Density: If you're referring to population density, then Monaco is the most densely populated country with over 19,000 people per square kilometer.
* Solid Earth: If you're referring to geological density, meaning the mass per unit volume of the Earth's solid material, then the Earth's core has the highest density, with an average density of around 10.9 g/cm³.
Could you please clarify your question? Do you want to know:
* The country with the highest population density?
* The densest part of the Earth's interior?
* Something else entirely?
Once I know what you're looking for, I can provide a more accurate answer.
