Leaking Coolant

I have a 1996 riviera supercharged. I just replaced the water pump because it went bad and I was leaking coolant. After that I noticed that the seal was bad on the water pump so I took everything apart again and re-sealed the water pump. I am still leaking coolant. It is no longer leaking around the water pump. There is no wet spots on the interior of the car so I do not think it is the heater core. No hoses look worn or seem to be leaking. What else could be leaking?