A keel boat,[1] keelboat,[1] or keel-boat[2] is a type of usually long, narrow cigar-shaped riverboat,[1] or unsheltered water barge which is sometimes also called a poleboat—that is built about a slight keel and is designed as a boat built for the navigation of rivers, shallow lakes, and sometimes canals that were commonly used in America including use in great numbers by settlers making their way west in the century-plus of wide-open western American frontiers.Keelboats have been used for exploration, such as during the Lewis and Clark Expedition,[3] but were primarily used to transport cargo or settlers in the early 19th century.Historical account of two keelboats published in the original Courier Journal of Lafayette, Indiana, in 1833: We stop the press to announce the arrival this morning of the steam-boat, REPUBLICAN, Toll, Master from the rapids of the Wabash.In Ireland the Howth 17 was designed by Sir Walter Boyd in 1897, and is the oldest one-design racing keelboat in the world.[citation needed] In some countries yachts can also be differentiated from keelboats with the addition of a toilet or "head" as the term "keelboat" is in some places understood to mean a sailboat with a keel that is designed purely for recreational/racing purposes, while the term "yacht" describes a sailboat designed for overnight transport.