The town is situated on the Neyyar River, one of the principal rivers in the district.
The principal rivers of the Empire flow from the east to the west, and as they converge they become greater still.
The principal river running through it is the Illinois River.
Hydrology: The principal river is the Parapetí, among many others.
The province has two principal rivers and two mountain ranges.
"Some large fish from the Amazon were introduced into our principal river three years ago to improve fishing yields."
The Mahanadi River is the principal river of this district.
Often found in counter current zones of principal rivers and creeks.
Smaller springs and streams serve as tributaries to the principal rivers.
The principal river in the town is the River Yarrow.
