Riparian is an adjective that means related to rivers or streams. 

Our word of the day, which has been around since the mid-19th century, can refer to something situated on the bank of a river, or it can simply mean something pertaining to a river. here’s an example of the latter:

My dog Bobby used to love those walks we would take to the river. Those riparian strolls were some of the most fun we would ever have.