big ocean boats can get up the river until manaus, which is almost 1500 kilometers (900 miles) from its mouth. smaller ocean ships of 3,000 tons and 7.9 m (26 ft) draft can reach as far as iquitos in peru, 3,700 km (2,300 miles) from the sea. smaller riverboats can reach 780 km (486 mi) higher as far as actual point. beyond that, small boats frequently go up to the pogo ode escherichia's, just above actual point.