The southern part of the country includes a substantial portion of Lake Victoria, while the northern part Uganda lies within the Nile basin. The outflow of Lake Victoria at Jinja (Ripon Falls - now no longer visible because of the Owen Falls Dam) is the head of the main river Nile.
As people can not occupy water the answer must be the "Nile basin".
One of Rio de Janeiro's most prominent physical features is Sugarloaf Mountain.
Water, specifically the ocean, is the most common physical feature near which people live.
water
A volcano.
The horn
mountains
mountain ranges
The Great Lakes.
The Nile River.
It is the plains.
Popocateptl, one of the world's most dangerous volcanos.
The most dominant physical feature of planet Earth is its water, which covers about 71% of the planet's surface. The oceans play a crucial role in regulating the Earth's climate and supporting various forms of life.