Mukho Lighthouse in Donghae (South Korea). Not a country I receive a lot of mail from! The stamp, or label, also caught my attention:
Vladivostok. Despite its modest size, this is one of Russia's best known lighthouses. It is named for Capt. M.J. Tokarev, whose ship surveyed the area in 1862-63.
On the back of the postcard (How nice it is!), a matching stamp from 1984, showing the same lighthouse:
Postcards sent by Ania (South Korea & Russia).