This iconic Grand Theft Auto V location is called the Los Santos Storm Drain, and it's based on the Los Angeles River. Races and missions take place in this area, so experienced players will have encountered it a few times by now.

The worn look of the lane fits the game perfectly, although the river's proportions have been toned down for the game. Why developer Rockstar Games decided to make the river smaller than it is in real life is unknown. Perhaps they shrunk the river, so players could drive through it.