 Failing agreement on that, a second option would be to continue southwards the line of the Luapula-Lake Mweru valley (longitude 28° 35' E) which forms the longest north-south part of border, until it intersects the Congo-Zambezi watershed.So all of the country immediately east of a north-south line through Ndola would then be in Northern Rhodesia.But the Belgians hoped for access to the rich game areas of the Bangweulu wetlands and pressed for the borders to stick to the river and watershed.