tlavideo.com

From the liner notes

Dr. Frosta (Ramiro Oliveros) has been conducting illegal and immoral experiments on the recently deceased in an effort to conquer death and perfect the mental control of his subjects. All that Simone (Marcia Bichette), his estranged girlfriend knows is that the doctor works too hard and doesn t give her enough attention. The police inspector (Fernando Sancho) assigned to the case is getting closer and closer to catching and stopping the doctor. Also, Dr. Frosta has been dumping the dead rejects from his experiments into the swamp. Unfortunately, the dead are now undead, and the swamp water is infested with living corpses bent on a showdown with the mad doctor!

The Swamp of the Ravens DVD also includes the following film:

Zombie (1976)
Best–selling author Tom Harris is working on his next book and schedules a trip to the aptly–named Voodoo Island. Engine problems force their plane to land on the beach where Tom meets a native skinny–dipper and the zombie who is stalking her. The zombies have been created by Dr. Billedeaux with radioactive snake venom but are under the control of a voodoo witch doctor whose plan is to sacrifice the doctor's lovely daughter.