Russia
102,000 km (including 33,000 km with guaranteed depth)
note: 72,000 km system in European Russia links Baltic Sea, White
Sea, Caspian Sea, Sea of Azov, and Black Sea (2005)
Rwanda
Lac Kivu navigable by shallow-draft barges and native craft
(2005)
Senegal
1,000 km (primarily on Senegal, Saloum, and Casamance
rivers) (2005)
Serbia
587 km - primarily on Danube and Sava rivers (2005)
Sierra Leone
800 km (600 km year round) (2005)
Slovakia
172 km (on Danube River) (2005)
Spain
1,000 km (2003)
Sri Lanka
160 km (primarily on rivers in southwest) (2005)
Sudan
4,068 km (1,723 km open year round on White and Blue Nile
rivers) (2005)
Suriname
1,200 km (most navigable by ships with drafts up to 7 m)
(2005)