Angrapa is a river in northeastern Poland

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 and 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...

 (Kaliningrad Oblast

Kaliningrad Oblast

Kaliningrad Oblast is a federal subject of Russia situated on the Baltic coast. It has a population of The oblast forms the westernmost part of the Russian Federation, but it has no land connection to the rest of Russia. Since its creation it has been an exclave of the Russian SFSR and then the...

). It originates in Masuria

Masuria

Masuria is an area in northeastern Poland famous for its 2,000 lakes. Geographically, Masuria is part of two adjacent lakeland districts, the Masurian Lake District and the Iława Lake District...

 and flows into the Pregolya

Pregolya

The Pregolya or Pregola is a river in the Russian Kaliningrad Oblast exclave.It starts as a confluence of the Instruch and the Angrapa and drains into the Baltic Sea through Vistula Lagoon. Its length under the name of Pregolya is 123 km, 292 km including the Angrapa. The basin has an...

, of which it is a main tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

.

The Angrapa has a length of 172 km and a basin area of 3,639 km². The Russian name Angrapa is derived from the old German name Angerapp, which in turn is derived from the Old Prussian

Old Prussian language

Prussian is an extinct Baltic language, once spoken by the inhabitants of the original territory of Prussia in an area of what later became East Prussia and eastern parts of...

 words anguris (eel) and apis (river). The river's name therefore means "Eel

Eel

Eels are an order of fish, which consists of four suborders, 20 families, 111 genera and approximately 800 species. Most eels are predators...

 River". The city of Ozyorsk

Ozyorsk, Kaliningrad Oblast

Ozyorsk is a town and the administrative center of Ozyorsky District of Kaliningrad Oblast, Russia, located on the Angrapa River, southeast of Chernyakhovsk near the border with the Polish Warmia-Masuria Voivodship. Population: -Notable residents:...

lies on the Angrapa.