Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Oyapock - The Oyapock or Oiapoque River (/pk/ or /poki/; French: Fleuve Oyapock [flv wjapk]; Portuguese: Rio Oiapoque [jpki]) is a 370-km (230-mi)long river in South America that forms most of the border between French Guiana and the Brazilian state of Amapa. It rises in the Tumuk Humak (Portuguese: Tumucumaque) mountain range and flows into the Atlantic Ocean where its estuary forms a large bay bordering on Cape Orange.
Answer:
Natural Place