Used to describe travel using watercraft or through waterways. Many goods are shipped by water across the globe.
Pro Tip 2/3
Travel Context
Mention 'by water' when specifying the travel medium in contrast to land or air. While you can reach the mainland by road or air, the island is accessible only by water.
Pro Tip 3/3
Geographical Features
Use when describing routes or areas characterized by large water presence. The trade route primarily goes by water, following the coastline.