On 21 February 1881 , in a note to Lord Grenville , Minister of Foreign Affairs of Great Britain at that time , Venezuela suggested a border line starting from a point one mile to the north of the Moruka River , drawn from there westward to the 60th meridian , and running south along that meridian . On 21 February 1881 , in a note to Lord Grenville , the Minister of Foreign Affairs of Great Britain at that time , Venezuela proposed a frontier line starting from a point one mile to the north of the Moruka River , drawn from there westward to the 60th meridian and running south along that meridian .