Under the aegis of the Royal Geographical Society, the German-born explorer and naturalist Robert Hermann Schomburgk conducted botanical and geographical exploration of British Guiana in 1835. This resulted in a sketch of the territory with a line marking what he believed to be the western boundary claimed by the Dutch. As a result of this, he was commissioned in 1840 by the British government to survey Guiana's boundaries. This survey resulted in what came to be known as the "Schomburgk Line". The Line went well beyond the area of British occupation and gave British Guiana control of the mouth of the Orinoco River. According to Schomburgk, it did not contain all the area that Britain might legitimately claim.