St. Peter Island is a small 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...

n island in the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

, with an area of 0,025 square kilometres and a height of 9 metres above sea level. Also known as Bird Island, it is located in the Bay of Sozopol

Sozopol

Sozopol is an ancient seaside town located 35 km south of Burgas on the southern Bulgarian Black Sea Coast. Today it is one of the major seaside resorts in the country, known for the Apollonia art and film festival that is named after one of the town's ancient names.The busiest times of the year...

, close to the St. Ivan and St. Cyricus Island

St. Cyricus Island

St. Cyricus Island , also known as St. Cyril Island or Sts. Quiricus and Julietta Island is a Bulgarian island in the Black Sea, situated 150 metres from Sozopol's Stolets peninsula. It has an area of about 0,08 square kilometres and a height of 15 metres. The island is connected to the continent...

s. As it was not mentioned in any sources until the mid-19th century, it is presumed to have separated from the larger St. Ivan Island

St. Ivan Island

St. Ivan Island is the largest Bulgarian island in the Black Sea, with an area of . It lies off the Bulgarian Black Sea Coast near Sozopol, a town with rich history and a popular tourist place, and is separated by a strait several hundred metres long from the small neighbouring St. Peter Island....

 (which is a few hundred meters to the west) as a consequence of some kind of natural phenomenon

Natural phenomenon

A natural phenomenon is a non-artificial event in the physical sense, and therefore not produced by humans, although it may affect humans . Common examples of natural phenomena include volcanic eruptions, weather, decay, gravity and erosion...

 around that time. Archaeologists have discovered the ruins of a Bulgarian National Revival

Bulgarian National Revival

The Bulgarian National Revival , sometimes called the Bulgarian Renaissance, was a period of socio-economic development and national integration among Bulgarian people under Ottoman rule...

-time chapel

Chapel

A chapel is a building used by Christians as a place of fellowship and worship. It may be part of a larger structure or complex, such as a church, college, hospital, palace, prison or funeral home, located on board a military or commercial ship, or it may be an entirely free-standing building,...

, as well as traces of ancient pottery. Two small islets or large rocks also existed to the east of St. Peter, known by the names of Milos and Gata; they were last described by Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

n war correspondents in the 1820s and have presumably submerged in the following years.