The phrase "southeast corner" refers to the part of a place or object that is located in the direction between the south and the east sides, where those two sides meet. Full definition
As the county seat of Laramie County, Cheyenne is located in the very southeast corner of Wyoming. (valuepenguin.com)
- View from southeast corner of Windmill Animal Hospital (windmillvet.com)
Larry laughed and came lumbering down the steps and stood in the very southeast corner of the court and said «feed me balls» which we did and he proceeded to hit 5 perfect all net swishes in a row. (sbnation.com)