What does Journey to the Marsh reward?

No reward has been recorded for Journey to the Marsh yet.

Where does Journey to the Marsh start?

Anastasia Hartwell in Undercity offers it.

The quest log lists it at level 38.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest · level 38

A level 38 quest in World of Warcraft: Forever, offered by Anastasia Hartwell in Undercity. Recorded by 2 players running the addon.

Pay and objectives show once a player with the addon accepts the quest.

No reward item has been recorded for this quest. The offer window fills this in when a player with the addon opens it.

What does Journey to the Marsh reward?: No reward has been recorded for Journey to the Marsh yet.
Where does Journey to the Marsh start?: Anastasia Hartwell in Undercity offers it.
What level is Journey to the Marsh?: The quest log lists it at level 38.
Is Journey to the Marsh new in WoW Forever?: No. The quest exists in Classic Era as well.

What sells at this level, and what to keep from these rewards, is in the level 30 to 40 gold guide.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Undercity