A world beneath.
A sky beyond.

A sheltered coast places broken stone terraces beside clear blue shallows.

Forested hills conceal shallow caves beneath broad root systems.

A wide river crosses farms, modest cliffs, gravel banks, and scattered settlement sites.

A mountain district contains exposed faces, sheltered bowls, scree-like slopes, and passages where daylight reaches surprisingly far underground.

A lush, wet woodland hides sinkholes, fern-lined openings, and shallow pools under a dense canopy.

Broad roots follow chamber roofs and form occasional natural arches.

Pale mineral shelves descend around a shallow stream.

Warm-colored seams run through worn channels and modest chambers.

Clear pools occupy a stepped pocket system with pale crystal growth near the waterline.

A comparatively dry region contains smooth roof domes, gravel fans, narrow chimneys, and broad undisturbed floors.

Tall root columns support hanging leaves and softly luminous growth.

Low fungal fields surround shallow water and scattered boulders beneath a vaulted roof.

Vertical walls carry vegetation on stepped shelves above a narrow river.

A low, wet district contains dark shallow water, root islands, broad leaves, and luminous shoreline growth.

Dry stone bowls contain pale woody growth, leaflike litter, sheltered pools, and spacious gaps between trunks.

Broad folded-looking rock ribs divide parallel valleys and stepped mining faces.

Pale mineral crusts frame still, dark pools beneath high, relatively clean vaults.

A substantial underground river passes stone quays, natural gravel bars, rock arches, and dry former banks.

Pale outer crystal growth surrounds smoky cores with quiet internal lines, occupying fractures and isolated fans within dark rock.

Broad dry floors, scattered pillars, shallow gullies, and distant wall shelves create one of the first places that feels like underground countryside.

Massive irregular columns and isolated wall shelves divide a deep cavity.

A large underground lake contains dark open water, quiet coves, exposed rock islands, and submerged terraces.

Pale flowing-looking mineral forms spread across dark walls and create terraces of contrasting texture.

Interconnected narrow clefts open unexpectedly onto larger spaces.

Broken natural terraces descend through successive water levels and dry ledges.

Broad dark terraces and broken column formations descend beside clearly contained hot channels.

Warm sheltered basins support tough, luminous growth around shallow mineral pools and small vents.

Quiet dry chambers contain pale dust deposits, layered banks, dark rock islands, and the traces of inactive heat channels.

Black glassy surfaces and red-brown fractured stone frame cooled flow shapes near active fissures.

Large roof pockets enclose warm pools, mineral chimneys, wet stone bridges, and clearly readable vent openings.

Sparse mineral structures rise from dark ground in recognizable clusters.

Pale mineral ribs and crystal seams spread across broad shelves, creating a strong rhythmic landscape.

Exceptionally clear pools fill quiet chambers edged with pale stone and restrained luminous plants.

Dark rootlike mineral and biological structures occupy separated stone islands above a shallow glowing substrate or deeply recessed fissure system.

An uncommon major regional landmark combines natural enclosing forms with space for the Earth chapter destination.