Sure! Here are the matched descriptions with their corresponding terms:
- Stretches of it act as a natural border between the U.S. and Mexico - Rio Grande
- Narrow curve of land that connects North and South America - Isthmus of Panama
- This body of water is a natural border between the U.S. and Canada - Great Lakes (or more specifically, Lake Ontario, Lake Erie, Lake Huron, Lake Michigan, Lake Superior)
You can match these descriptions with the terms accordingly!