Question

what are inland Waterways and sea route

Answer 1

Throughout Iceland the water is particularly clean. One can safely drink from almost any lake or river, although glacial water is not particularly tasty. Because of the heavy rainfall, Icelandic has plenty of rivers and they are relatively large.

Answer 2

india has an extensive network of inland waterways in the form of rivers ,canals,backwaters ,creeks.
sea route is the route followed by the ships