The ground has a red colour from the rocky soil, called laterite, a clay enriched with iron and aluminum. It gets blown around a lot in the wind. It sets off the white student residences nicely, but is a pain for people to drive on when a road is in disrepair or where the dirt must suffice.
I did some quick reading on how these super colonies are made and what their function is. It seems the terminates either carry the sand to the highest point and drop the sand, or they actually sculpt as they go along. The ants store food inside. Ones that are broken open reveal a pile of refuse at their base. The queen termite is also protected on the inside. She has been known to live up to 21 years. The males all die very quickly after they've performed their function. Probably why I didn't see any termites. In 2008, a professor here, Kwadwo Osseo-Asare got his students to do a little research on these hills. What they had to say is very interesting.