Let z and z’ be two points in the standard fundamental set in the upper half-plane. If the corresponding elliptic curves are related by an isogeny of degree N, then there is a 2×2 matrix with integer coefficients and determinant N which maps z to z’. As an ingredient in their work on unlikely intersections, Habegger and Pila proved that the entries of this matrix are bounded by a uniform polynomial in N. I will discuss the generalisation of this result to moduli of abelian varieties and beyond, to Riemannian symmetric spaces of non-compact type.