Nevertheless , the central part of the river has retained much of its natural character and in later years conscious efforts have been made to protect the nature and ecosystem of the river basin .
Agriculture also contributes to spreading nitrogen and other nutrients into the river .
The central part of the river has retained much of its natural character and in later years conscious efforts have been made to protect the nature and ecosystem of the river basin .
Agriculture also contributes to spreading nitrogen and other nutrients into the river .