From Bulbapedia, the community-driven Pokémon encyclopedia.
A sea route or water route (Japanese: 水道 water route), is a route that crosses a body of water, and may be made up nearly entirely of water, with only a few islands. Sea routes typically begin to appear late in the game, and can usually only be traversed by using Surf.
Sea routes are often among the longest routes in the games, often densely-populated with Swimmers who use Water-type Pokémon. Unlike land routes, on sea routes wild Pokémon can attack at any time, forcing Trainers to stay alert. Typically, Tentacool and Tentacruel are common sights.
Some sea routes in Johto have whirlpools blocking the way, while some in Hoenn have spots where it is deep enough to dive underwater.
List of sea routes
The following is a list of sea routes in the Pokémon world. This list includes those routes which are numbered sequentially in a region as well as those which do not have numbers, but names instead, and help to link between numbered routes.
Numbered sea routes
Named sea routes
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