Sahara.

The eleventh classic Dirk Pitt novel, where the adventurer is drawn to a secret in the burning African desert, which could destroy all life in the world's seas. A CREEPING RED TIDE OF DEATH Deep in the African desert, Dirk Pitt discovers that a top secret scientific installation is leaking a lethal chemical into the rivers, threatening to kill thousands of people - and to destroy all life in the world's seas. To warn the world of the catastrophe, Pitt must escape capture and death at the hands of a ruthless West African dictator and French industrialist, and undertake a long, perilous journey across the merciless Sahara....