What stands out in A mountain bowl with villages and Ancient Cities below
The bowl can hold a large settlement without losing its mountain skyline. The villages make the wider area useful for beds, food, trading, and iron, while the deep-dark layer gives the same region a dangerous late-game objective below the peaceful surface.
How I would approach this world
I would keep the bowl itself for the main build, connect the outside villages with passes, and delay the Ancient City route until the surface base is established. That creates a natural progression from settlement building to underground exploration.
Before settling into the world
Open the seed in Java 26.2, travel to about 200, -950, and walk the rim before choosing a build center. Check each village separately and prepare wool, food, and a safe retreat before entering the deep dark.