Nor are there any long rivers, and all are so broken by shallows and rapids that navigation is generally impossible except by means of flat-bottomed boats drawing only a few inches.
Two or three flat-bottomed sailing vessels navigate the lake of Urmia in north-western Persia, carrying merchandise, principally agricultural produce, from the western and south-western shores to the eastern for the supply of Tabriz.
The characteristic conveyances on the canals of Venice - which take the place of cabs in other cities - are the gondolas, flat-bottomed boats, some 3 o ft.
Naval preparations went on apace at all the dockyards, and numbers of flat-bottomed boats were built or repaired at the northern harbours.
On the other hand the broad, gently-sloping, sandy beach is peculiarly fitted for sea-bathing, and in the absence of harbours permits the beaching of the characteristic flat-bottomed fishing boats.
Formerly of some importance, the harbour can no longer be entered by large vessels, and goods are transhipped into flat-bottomed lighters for conveyance ashore.
Navigation on the lower Magdalena closely resembles that of the Mississippi, the same type of light-draft, flat-bottomed steamboat being used, and similar obstacles and dangers to navigation being encountered.
Caesar, who had been hastily summoned from Illyricum, crossed the Loire and invaded Brittany, but found that he could make no headway without destroying the powerful fleet of high, flat-bottomed boats like floating castles possessed by the Veneti.
Large flat-bottomed boats are towed across the river by small horses attached to an outrigger projecting beyond the gunwale by means of a surcingle or bellyband.
In a distance of 2 m., but the current is swift and the channel tortuous for a distance of 20 m., which make it impossible for the light-draught, flat-bottomed steamers of the lower river to ascend them.