Which field does the theme activity of "Walking in Nanjing" belong to?

The theme activity "Walking in Nanjing" belongs to the field of mathematics. The slogan of "Walking in Nanjing" activity is: Through integration and practice, the course of "Walking in Nanjing" collided with three other fields of mathematics-number and algebra, graph and geometry, statistics and probability-and the landscape of Jiangsu gardens, which made each of our students clear again what walking is, why to walk and how to walk.