Santiago e Guayaquil, or just Guayaquil (pronounced [waʝaˈkil]), is the largest and the most populous city in Ecuador, as well as that nation's main port. Guayaquil is on the west margin of the Guayas River, which flows into the Gulf of Guayaquil in the Pacific Ocean. The climate is hot and generally dry. Though during El Niño years rainfall is very heavy between January and April and flooding usually occurs, from May to December and outside El Niños, there is almost no rain as the city is influenced by the Humboldt Current. Fog is a normal occurrence during the dry months, so that sunshine hours are actually a little higher during the "wet" season.