Final answer:
The Guayas River flows into Guayaquil Bay in the city of Guayaquil, located in Ecuador.
Step-by-step explanation:
The country where the Guayas River flows through the city of Guayaquil into Guayaquil Bay is Ecuador. Guayaquil is a major port city in Ecuador, and the Guayas River is one of the most important rivers in the country, vital for transport and commerce. In July 1822, significant historical events took place in Guayaquil, where meetings between revolutionary leaders Simón Bolívar and José de San Martín occurred, which played a crucial role in the South American independence movements. The Guayas River flows into the city of Guayaquil, which is the largest city in Ecuador and the country's main port. Guayaquil is located on the west bank of the Guayas River, and the river eventually empties into the Gulf of Guayaquil, which is an arm of the Pacific Ocean.