The largest and most important river system in South America is the Amazon. Making A your answer.
Centrally, with good access roads. And central to the maybe tri city school districts. So equal distant to the surrounding schools
Layers such as population with an age of less than 25, and or with a population of 20-35 for future athletes being born into.
probably with about 200+ per square mile.
Depending on the area
Not to be gender bias but you could look for higher male than female. Or opposite.
Could profile with race..
and also checking surrounding parks /fields, and other sporting goods stores
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People have lived in Australia for over 65,000 years. The first people who arrived in Australia were the Aboriginal people and Torres Strait Islanders.. They lived in all parts of Australia.
Many animals that live in the river depend on the recycling of the nutrients.