I think usually it is “X is the armpit of Y”, for example NJ is the armpit of America: https://knowswhy.com/why-is-nj-called-the-armpit-of-america/ https://know

I think usually it is “X is the armpit of Y”, for example NJ is the armpit of America: https://knowswhy.com/why-is-nj-called-the-armpit-of-america/ https://knowswhy.com/why-is-nj-called-the-armpit-of-america/