The Ölfusá River is one of the longest rivers in Iceland, flowing approximately 30 kilometers from the Þingvallavatn lake to the Atlantic Ocean. It is known for its scenic beauty and is an important waterway for the surrounding communities. The river is fed by several smaller streams and is characterized by its clear waters and rich biodiversity. It is popular for activities such as fishing and kayaking, attracting both locals and tourists who appreciate its natural environment and recreational opportunities.