Fallout: New Vegas locations project
Scorpion burrow is an unmarked location in the Mojave Wasteland. It is an unmarked location south of Nipton Road pit stop in the dry lake bed. Go past the crashed airplane, and head to the area with grass and rocks. There is a large mix of radscorpions of all sizes in the vicinity.
Aside from the obvious threat of multiple giant radscorpions, a pack of night stalkers roams nearby. The two creature types normally attack each other, but if the Courier is detected, they'll attack the Courier instead.
The entrance looks like the ant mound. Inside is a large single-room cavern containing several radscorpions, a radscorpion queen, and five lootable dead bodies of various factions.
This scorpion burrow appears only in Fallout: New Vegas.