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Arroyo Napostá is located in the region of Bahía Blanca, Buenos Aires Province, 
It is a stream whose watershed is in Sierra de la Ventana, about northeast to Bahía Blanca. It was essential during the early history of the city of Bahia Blanca as a source of water and also as a natural defense against aborigine. Later on it was useful as a water supply for agriculture.
It drains to the
Bahia Blanca, Municipal Administration
Parasitología latinoamericana
Rivers of Buenos Aires Province Bahía Blanca Rivers of Argentina {{Argentina-river-stub
Argentina
Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
It is a stream whose watershed is in Sierra de la Ventana, about northeast to Bahía Blanca. It was essential during the early history of the city of Bahia Blanca as a source of water and also as a natural defense against aborigine. Later on it was useful as a water supply for agriculture.
It drains to the Atlantic Ocean
The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...
reaching the Estuary of Bahia Blanca. It forms meander
A meander is one of a series of regular sinuous curves in the channel of a river or other watercourse. It is produced as a watercourse erodes the sediments of an outer, concave bank ( cut bank) and deposits sediments on an inner, convex ba ...
s before and as it enters the city in the area of Club de Golf Palihue, then Parque de Mayo, where a weir
A weir or low head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the river level. Weirs are also used to control the flow of water for outlets of l ...
has been built at a natural split, to avoid flooding after heavy rains in Ventana mountain range
A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arise ...
. If flow increases enough and the level of the stream surpasses the weir, water flows also to the alternative branch reaching the estuary through the Maldonado stream.
From there downstream it flows naturally through the city although it has been piped shortly thereafter to create a greenspace named ''Paseo de las Esculturas'', which became quite popular in the last years, and a very interesting urban area by which properties increased substantially their price since then. Napostá is heavily contaminated distally, even before reaching the city, probably due to techniques of fertilization carried out in the areas which form its watershed, especially close to the cit
References
Bahia Blanca, Municipal Administration
Parasitología latinoamericana
Rivers of Buenos Aires Province Bahía Blanca Rivers of Argentina {{Argentina-river-stub