Surface mail is post sent by land and sea rather than air. Send it surface mail, surface mail takes weeks.
It is far cheaper for anything heavy and can take two months to cross the world. Surface mail is the only sensible way to send books abroad in quantity.
1nounsurface mailPost sent by land and sea rather than air.
“The boxes went by surface mail and arrived in March.”
surface mail is a service.
Practised in Bank & Post Office