The foothills begin south of Grozny and run close to 20 miles until they merge into the Caucasus Mountains in the south.
Generally the captions are based on misunderstood slang and sexual innuendo, but occasionally they just reflect the surprise an eighteen-year-old might have at finding out how life actually works.
The substance to be investigated was wiped by a collection paper, which was subsequently sprayed from an aerosol can.