For a comprehensive introduction to river cruising, click here: http://www.cruisecritic.com/river/   Other basic articles: River Cruise Basics http://www.cruisecritic.com/articles.cfm?ID=18   Accessible River Cruise Basics http://www.cruisecritic.com/articles.cfm?ID=1959   American vs. European River Cruises http://www.cruisecritic.com/v-2/articles.cfm?ID=2154   Best Active River Cruises http://www.cruisecritic.com/articles.cfm?ID=2610   Best Family River Cruises http://www.cru