Why, when moving along a 2 dimensional array, the pointer jumps to 16 bytes

I have a two-dimensional array **parr it is filled with random numbers There is such a site

 int **ptr = 0; ptr = parr; cout << *ptr << ' '; ptr = ptr+1; cout << *ptr << ' '; cout << endl; 

In which I look at how the address changes, instead of moving by 4 bytes, my pointer moves by 16 bytes. I want to understand why this is happening and how to move the pointer to 4 bytes?