Because people go to the toilet in the sea, which causes pollution and therefore kills the fish in the ocean etc.
Rio.
1502
carp
Rio de janeiro
Rio de janiero
January's River.
Rio de Janiero is the name of the city. The Stadium there is the Maracana Stadium
Rio de Janiero
Hard
Niteroi Park
The famous Brazilian city that starts with 'Rio de', is Rio de Janiero.
Yes, ships dock there regularly.