Q. Broad lower course of a river that is encroached on by the sea and affected by the tides is also known as _______?
Answer: Estuary
Notes: Broad lower course of a river that is encroached on by the sea and affected by the tides is also known as Estuary. An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea.