The Feerrott is an outdoor zone for levels 35-45. It is dense with monsters and complicated to travel around, but is full of solo quests, and will teach you to be a better solo player.
Upon passing through the beach tunnel for the first time you will be offered the quest A Vision of Fear. This is an introductory quest that will guide you to many of the major landmarks in the front half of The Feerrott.
Note: The Feerrott has no merchants beyond the starting area. However, The Hidden Village of Kugup is connected to the far end of the Feerrott, and it has merchants inside. Very useful for anyone who spends much time in the Feerrott. To gain access to this village, complete the Froglok Timeline.
Feerrott Main Quest Line
There are separate versions of each quest in this timeline for good and evil people, but they are equivalent - good and evil people can work together on them. Regardless of your alignment, there are four solo quest lines for you, which can be worked on simultaneously.
While you are out here, it's not a bad idea to pick up a snack! Talk to Reza, who stands at random locations on the wall of the first valley (he can be near the good camp or the evil camp). His first 2 quests each reward level 50 Superior food.