Tvarditsa is a town in Sliven Province

Sliven Province

Sliven Province is a province in southeastern Bulgaria, named after its administrative and industrial centre - the city of Sliven. It embraces a territory of 3,544.1 km² that is divided into 4 municipalities, with a total population, as of December 2009, of 204,887...

, Southeastern Bulgaria

Bulgaria

Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

. It is the administrative centre of the homonymous Tvarditsa Municipality. As of December 2009, the town has a population of 5,669 inhabitants.

Tvarditsa is located on the southern slopes of Stara Planina. The area around is known as the Tvarditsa Coal Basin, the only place in the country where soft coal is mined.

Tvarditsa Rocks

Tvarditsa Rocks

Tvarditsa Rocks is a group of rocks off the north coast of Greenwich Island in the South Shetland Islands, Antarctica situated northeast of Ongley Island, southwest of Stoker Island and west of Sierra Island....

 in the South Shetland Islands

South Shetland Islands

The South Shetland Islands are a group of Antarctic islands, lying about north of the Antarctic Peninsula, with a total area of . By the Antarctic Treaty of 1959, the Islands' sovereignty is neither recognized nor disputed by the signatories and they are free for use by any signatory for...

, Antarctica are named after Tvarditsa. The Bessarabian Bulgarian

Bessarabian Bulgarians

The Bessarabian Bulgarians are a Bulgarian minority group of the historical region of Bessarabia, inhabiting parts of present-day Ukraine and Moldova.- Location and number :-Modern Ukraine:...

 village of Tvardiţa

Tvardiţa

Tvardiţa is a commune in Taraclia district, Moldova. It is composed of a single village, Tvardiţa. The village was founded following the Russo-Turkish War by Bulgarian refugees from Tvarditsa, a town just south of the Balkan Mountains, and the surrounding region...

 in Taraclia District, Moldova

Moldova

Moldova , officially the Republic of Moldova is a landlocked state in Eastern Europe, located between Romania to the West and Ukraine to the North, East and South. It declared itself an independent state with the same boundaries as the preceding Moldavian Soviet Socialist Republic in 1991, as part...

, was founded by refugees from Tvardisa, who named it after their ancestral town.