 Venezuela disputed Schomburgk's placing of border markers at the Orinoco river, and in 1844 claimed all of Guiana west of the Essequibo River.Also in 1844, a British proposal to Venezuela to modify the border to give Venezuela full control of the Orinoco river mouth and adjacent territory was ignored.In 1850 both Britain and Venezuela reached an agreement whereby they accepted not to colonize the disputed territory, although where this territory began and ended was not established.