Definition
When a waterway is *unnavigable*, it means you can't travel on it by boat. 🛶 Imagine a river filled with rapids, or a canal choked with weeds. It's not just difficult; it's essentially impassable for vessels. Think of it as the aquatic version of a dead-end street. It could be due to natural obstacles or human-made barriers. The opposite is a clear, open waterway.