The River Alblas is a small river located in the Netherlands. It flows through the province of South Holland and is a tributary of the River Beneden Merwede. The river is approximately 20 kilometers long and is known for its scenic views and natural surroundings. The Alblas is an important waterway for local agriculture and recreation. It supports various activities such as fishing, boating, and cycling along its banks. The river also plays a role in the region's drainage system, helping to manage water levels in the surrounding areas.