Puerto Rico has a diverse landscape, but it doesn't have any major deserts, mountains, or rivers in the same sense as other parts of the world. Here's a breakdown:

* Seas: Puerto Rico is surrounded by the Caribbean Sea, which is a major sea.

* Deserts: Puerto Rico does not have any major deserts. Its climate is tropical, with consistent rainfall.

* Mountains: While Puerto Rico does have mountains, none are considered "major" in terms of their size or prominence compared to other mountain ranges globally. The Sierra de Luquillo is the highest mountain range, with El Yunque, the tallest peak, reaching 3,494 feet. However, these mountains are part of a smaller, localized range.

* Rivers: Puerto Rico has numerous rivers, but none are considered "major" by global standards. The longest river is the Río Grande de Arecibo, which is roughly 63 miles long. Many of the rivers are relatively short and flow into the Caribbean Sea.

It's important to note that while Puerto Rico might not have major features in these categories, its landscape is still diverse and beautiful, with lush rainforests, coastal areas, and rolling hills.