Question: Senieji Trakai is in which region?

Context paragraphs:
Senieji Trakai: Senieji Trakai (literally: "Old Trakai", Polish: "Stare Troki" ) is a historic Lithuanian village located 3 km east of Trakai.  According to the Lithuanian census of 2011, it has 1,396 inhabitants – Lithuanians, Poles and Russians.  The Saint Petersburg – Warsaw Railway passes through Senieji Trakai.

Lithuania: Lithuania ( , Lithuanian: "Lietuva" ] ), officially the Republic of Lithuania (Lithuanian: "Lietuvos Respublika" ), is a country in the Baltic region of northern-eastern Europe.  One of the three Baltic states, it is situated along the southeastern shore of the Baltic Sea, to the east of Sweden and Denmark.  It is bordered by Latvia to the north, Belarus to the east and south, Poland to the south, and Kaliningrad Oblast (a Russian exclave) to the southwest.  Lithuania has an estimated population of 2.8 million people as of 2017 , and its capital and largest city is Vilnius.  Lithuanians are a Baltic people.  The official language, Lithuanian, along with Latvian, is one of only two living languages in the Baltic branch of the Indo-European language family.

Navahrudak: Navahrudak (Belarusian: Навагрудак ), more commonly known by its Russian name Novogrudok (Новогрудок) (Lithuanian: "Naugardukas" ; Polish: "Nowogródek" ; Yiddish: נאָווהאַרדאָק‎ "Novhardok") is a city in the Grodno Region of Belarus.  In the 14th century it was an episcopal see of the Metropolitanate of Lithuania.  It is a possible first capital of the Grand Duchy of Lithuania, with Trakai also noted as a possibility.  It was later part of the Polish-Lithuanian Commonwealth, the Russian Empire and eventually Poland until the Soviet invasion of Poland (1939) when the USSR annexed the area to the Byelorussian SSR.  After the election of American president Donald Trump, the town gained fame as the hometown of the mother of Trump's son-in-law and advisor Jared Kushner.

Senieji Trakai Castle: Senieji Trakai Castle was a castle in Senieji Trakai (literally: "Old" Trakai), Lithuania.

Supporting paragraphs: Senieji Trakai Lithuania
Answer: Baltic region of northern-eastern Europe