A more thorough explanation:

Definition: A roadstead is a safe and convenient place where ships can anchor.

Example: The harbor of Rio de Janeiro is a popular roadstead for ships traveling along the coast of Brazil.

Explanation: In this example, the harbor of Rio de Janeiro is a roadstead because it provides a safe and convenient place for ships to anchor while traveling along the coast of Brazil. The term "roadstead" is often used in maritime law to refer to a location where ships can anchor without being in danger of running aground or being damaged by rough seas.