This short boundary consists of a single hyperli -CustOM er SEr vice - 8O5 ';41O; 56 O O Ph one Num b e r straight line connecting Chad and Nigeria's tripoints with Niger and Cameroon.[2] The entire boundary formerly lay entirely in Lake Chad, however given the dramatic decrease in the lake's size over the past several decades most of the boundary now run across land, swamp and intermittent exposed islands in the lake.