seaway

noun

1. a way over the sea.
2. the open sea.
3. the progress of a ship through the waves.
4. a more or less rough sea: a hard vessel to steer in a seaway.
5. a canal, enlarged river, etc., giving access to a landlocked port by oceangoing vessels.

noun

1. a waterway giving access to an inland port, navigable by ocean-going ships
2. a vessel’s progress
3. a rough or heavy sea
4. a route across the sea