The phrase "offshore waters" refers to the area of oceans or seas that are farther from the shore or coast. It is the part of the water that is located beyond the immediate coastal area. Full definition
Small treasures await discovery, while whales gather in offshore waters. (caradonna.com)
The sharks are much more common along the coast than in offshore waters. (sciencedaily.com)
«A proposal for the first oil and gas drilling in federal offshore waters of the Arctic took a step forward Thursday as regulators released a draft environmental impact statement, which reflects concerns about the effects of the project on marine life and local communities.» (sej.org)