The phrase "northeastern edge" refers to the part of an area that is located in the northeast direction, typically near its outer boundary or border. Full definition
Seismic evidence shows the crack went north along the eastern edge of the caldera, then lava pierced the crust's surface and erupted inside and then outside the caldera's northeastern edge. (sciencedaily.com)
It lies in peaceful, roadless isolation along the northeastern edge of Hudson Bay in Canada, more than 20 miles from Inukjuak, the nearest human settlement. (scientificamerican.com)