Input (grade 6): At its maximum extent, it is about 140 km (87 miles) long, and 55 km (34 miles) wide.
Output (grade 3): It has a surface area of about 5,200 km ² (2,000 mile ²). At its biggest extent, it is about 140 km (87 miles) long, and 55 km (34 miles) wide.