内海
A large body of saltwater that is entirely or almost entirely enclosed by land.
内陆湖
A lake situated in the interior of a country, not directly connected to the sea.
位于远离海岸的湖泊。
内陆航行
Transport or travel by boat on rivers and canals within a country.
国内邮件
Mail service that operates within the borders of a single country.
在单一国家境内运营的邮政服务。