Map of Rio das Ostras, Brazil

Rio das Ostras is a city in Rio de Janeiro, Brazil, with a population of about 168,099. It lies at 22.5269°S, 41.9450°W. Rio das Ostras is about 978 km (608 mi) southeast of Brasília, the capital. The nearest city on our map is Macaé, 23 km to the northeast.

Rio das Ostras at a glance

Where is Rio das Ostras?

• The 19th largest city in Rio de Janeiro on this site.
• Located in the Southern and Western hemispheres.
• Daylight ranges from about 10 h 45 min on the shortest day to 13 h 31 min on the longest day (around 21 June and 21 December).

Cities near Rio das Ostras

• Macaé — 23 km northeast
• Armação dos Búzios — 25 km south
• Casimiro de Abreu — 27 km west
• São Pedro da Aldeia — 38 km southwest
• Cabo Frio — 41 km south
• Araruama — 56 km southwest
• Nova Friburgo — 66 km northwest
• Saquarema — 68 km southwest
• Rio Bonito — 71 km west
• Cachoeiras de Macacu — 73 km west

Largest cities in Rio de Janeiro

• Rio de Janeiro — 6,747,815
• Duque de Caxias — 866,347
• Nova Iguaçu — 843,046
• Belford Roxo — 518,384
• Niterói — 515,317
• Campos dos Goytacazes — 483,540
• São João de Meriti — 466,536
• Petrópolis — 294,926
• São Gonçalo — 285,439
• Volta Redonda — 279,971

Largest cities in Brazil

• São Paulo — 12,400,232
• Rio de Janeiro — 6,747,815
• Belo Horizonte — 2,721,564
• Salvador — 2,711,840
• Fortaleza — 2,400,000
• Manaus — 2,219,580
• Brasília — 2,207,718
• Curitiba — 1,948,626
• Recife — 1,653,461
• Goiânia — 1,536,097

Map of Brazil and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.