Railways: total: 88 km standard gauge: 40 km 1.435-m gauge (dedicated to ore transport) narrow gauge: 48 km 0.914-m gauge (dedicated to ore transport) Highways: total: 7,970 km paved: 590 km unpaved: 7,380 km (1996 est.) Waterways: 6,000 km total of navigable waterways; Berbice, Demerara, and Essequibo Rivers are navigable by oceangoing vessels for 150 km, 100 km, and 80 km, respectively Ports and harbors: Bartica, Georgetown, Linden, New Amsterdam, Parika Merchant marine: total: 2 cargo ship (1,000 GRT or over) totaling 2,340 GRT/4,530 DWT (1997 est.) Airports: 50 (1997 est.) Airports—with paved runways: total: 5 1,524 to 2,437 m: 3 914 to 1,523 m: 1 under 914 m: 1 (1997 est.) Airports—with unpaved runways: total: 45 1,524 to 2,437 m: 1 914 to 1,523 m: 10 under 914 m: 34 (1997 est.)